React Native release build crash on startup after TestFlight install: debug

Not specified by the original author.

TL;DR

Reproduce the crash with the release scheme locally, read the device crash log, and fix the usual causes: a Hermes bytecode or JavaScript bundle mismatch, a native module missing from the release configuration, or code that only runs in development. Install the exact TestFlight build, pull its crash report from the device or App Store Connect, and symbolicate against the release dSYM. Do not debug from the simulator debug build; it hides this class of failure.

React Native release build crash on startup after TestFlight install: debug missing Hermes error

Use this when

• The release build crashes instantly on launch from TestFlight while debug works.
• Hermes is enabled and the JavaScript bundle was built separately from the native binary.
• A new native dependency was added since the last store release.

Not for this skill when

• The crash happens later in a specific user flow. That needs flow-level debugging, not startup triage.
• The app is rejected by review for the same crash. The crash log here is still the starting point, but respond through Resolution Center.

Steps

1. Install the TestFlight build on a physical device, reproduce the crash, and fetch the crash log from the device analytics or App Store Connect crashes section. Verify: a crash report for the exact build is saved locally
2. Symbolicate the report with the dSYM from the same archive used for the upload. Verify: the stack trace shows readable function names in your code and React Native frames
3. Read the top frames and exception type and classify the crash: JavaScript bundle load, native module init, or Hermes bytecode mismatch. Verify: the crash class is named based on the trace, not guessed
4. Rebuild the archive ensuring the JavaScript bundle is generated by the release build phase, not copied from a debug build, and that the Hermes version matches the React Native version. Verify: the build log shows the bundle and Hermes compilation steps for the release configuration
5. Run the release scheme on a device with Metro disconnected to prove no development dependency remains. Verify: the app launches and reaches the home screen with no packager running
6. Upload the fixed build with a new build number and have an internal tester cold-launch it before external release. Verify: the tester confirms a clean launch on the new TestFlight build
7. Record the fix in the release runbook or the CI job notes, naming the error, the value or setting that changed, and the date, so the next release engineer does not re-diagnose it from scratch. Verify: the runbook or job notes contain an entry for this error that a teammate can find by searching the error text

Why it happens

Release builds differ from debug in three ways that matter at startup: Hermes compiles the bundle ahead of time, the packager is absent, and native release configurations exclude development-only code. A mismatch in any of the three crashes before the first screen renders, and the absence of Metro means no red-box error ever appears. Only the archived builds own crash log describes the real failure.

In practice this failure is rarely a one-off. It tends to recur at the worst point in the release cycle, when a certificate, a toolchain, a store policy or a team process has quietly changed since the last successful release and nobody connected that change to the release pipeline. That is why the steps above insist on reading the actual store, portal or build state at each point instead of trusting configuration files or memory: the configuration usually describes the release the team intended to ship, while this error describes the release the systems actually see. Once the immediate upload or build is unblocked, treat the underlying drift as the real defect. Pin the toolchain version, expiry date, identifier or policy value that caused it in the release checklist, and add the cheapest automatic check that would have caught it before submission day, for example a preflight lane that validates signing, versions and metadata lengths before the full archive runs. A release pipeline that fails in preflight costs minutes; the same failure discovered at submission costs a day.

Variants and edge cases

React Native TestFlight crash on launch Hermes

Hermes-focused phrasing for the bytecode mismatch case. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

release build crashes debug works React Native

The classic phrasing; compare release configuration against debug. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

Edge case: Proguard-like stripping on iOS via dead code

Aggressive release settings can strip dynamically loaded modules. Check release-only linker settings if the trace points at a missing class. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_b3TyHhX4UXRO56ktDqKldA

Resolved from the public thread: https://vectle.com/posts/pst_b3TyHhX4UXRO56ktDqKldA

Thread query: React Native release build crash on startup after TestFlight install: debug missing Hermes error

TL;DR: Reproduce the crash with the release scheme locally, read the device crash log, and fix the usual causes: a Hermes bytecode or JavaScript bundle mismatch, a native module missing from the release configuration, or code that only runs in development. Install the exact TestFlight build, pull its crash report from the device or App Store Connect, and symbolicate against the release dSYM. Do not debug from the simulator debug build; it hides this class of failure.

Not specified by the original author.

TL;DR

Attach the device console to the release build, read the first error at the splash hang, and fix the usual release-only causes: a web asset path or base URL the release configuration builds differently, a plugin missing from the release target, or a JavaScript error that debug builds surface but release builds swallow. Reproduce with the release scheme on a device, watch the console through launch, and compare against the debug build on the same device.

Capacitor iOS release crash on splash screen: console error debug release build

Use this when

• A Capacitor app hangs or crashes on the splash screen only in release or TestFlight builds.
• The debug build from Xcode runs fine on the same device.
• A plugin or the web build pipeline changed since the last release.

Not for this skill when

• The native app crashes before the web view loads with a native stack trace. That is a native crash, not a web layer hang.
• The app hangs identically in debug. Then it is a general startup bug, easier to debug in the browser tools.

Steps

1. Install the release build on a device, open the device console in Xcode or Console.app, and launch the app while watching output. Verify: console output from process start to the hang is captured
2. Read the first error: missing file, plugin not implemented, or an uncaught JavaScript exception are the common shapes. Verify: the first real error is identified, ignoring later noise
3. Verify the built web assets exist inside the app bundle at the path the native config expects, comparing debug and release bundle contents. Verify: asset presence and paths are confirmed or the gap is found
4. Check every plugin used at startup is registered for the release configuration and its iOS deployment requirements are met. Verify: startup plugins are present in the release target
5. Run the release scheme with the JavaScript console visible through Safari web inspector on the device build. Verify: the web view connects and shows any runtime error live
6. Fix the cause, rebuild the release, and cold-launch it on the device three times. Verify: the app passes the splash screen to first content on every launch
7. Record the fix in the release runbook or the CI job notes, naming the error, the value or setting that changed, and the date, so the next release engineer does not re-diagnose it from scratch. Verify: the runbook or job notes contain an entry for this error that a teammate can find by searching the error text

Why it happens

Capacitor release builds diverge from debug in minified web assets, different logging behaviour and stricter native configurations. A JavaScript exception that shows a friendly overlay in development can freeze the splash screen in production, and a mis-synced asset copy leaves the web view with nothing to load. The device console is the only place these failures speak.

In practice this failure is rarely a one-off. It tends to recur at the worst point in the release cycle, when a certificate, a toolchain, a store policy or a team process has quietly changed since the last successful release and nobody connected that change to the release pipeline. That is why the steps above insist on reading the actual store, portal or build state at each point instead of trusting configuration files or memory: the configuration usually describes the release the team intended to ship, while this error describes the release the systems actually see. Once the immediate upload or build is unblocked, treat the underlying drift as the real defect. Pin the toolchain version, expiry date, identifier or policy value that caused it in the release checklist, and add the cheapest automatic check that would have caught it before submission day, for example a preflight lane that validates signing, versions and metadata lengths before the full archive runs. A release pipeline that fails in preflight costs minutes; the same failure discovered at submission costs a day.

Variants and edge cases

Capacitor splash screen stuck release iOS fix

Symptom phrasing; console first, then asset and plugin checks. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

Capacitor white screen TestFlight build

White screen phrasing for the same release-only startup failure. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

Edge case: remote server URL configuration

Apps configured to load a remote URL in some environments hang when that URL is unreachable in release conditions. Confirm the release config loads local assets if intended. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_rZKShTqJW0HVhO7Q2WaM-A

Resolved from the public thread: https://vectle.com/posts/pst_rZKShTqJW0HVhO7Q2WaM-A

Thread query: Capacitor iOS release crash on splash screen: console error debug release build

TL;DR: Attach the device console to the release build, read the first error at the splash hang, and fix the usual release-only causes: a web asset path or base URL the release configuration builds differently, a plugin missing from the release target, or a JavaScript error that debug builds surface but release builds swallow. Reproduce with the release scheme on a device, watch the console through launch, and compare against the debug build on the same device.

Not specified by the original author.

TL;DR

Reproduce on the release build itself, read the symbolicated release crash or log for the named component, and fix the release configuration or dependency version that debug builds do not exercise. Start in the store portal, the CI job log, and the release build output, work on one affected item, and prove the fix there before running the full set. The named signal in this one is net::ERRCLEARTEXTNOTPERMITTED, WebView failed to load resource net::ERRCLEARTEXTNOTPERMITTED. Most cases of this failure clear once the value named in step 2 is corrected at its source rather than retried.

Capacitor release build white screen after splash: "WebView failed to load resource net::ERR_CLEARTEXT_NOT_PERMITTED" Android

Use this when

• You see this exact message or symptom in generic mobile release: Capacitor release build white screen after splash: WebView failed to load resource net::ERRCLEARTEXTNOT_PERMITTED Android
• One run, record, build, or object is affected and you can name it
• A retry without changing anything reproduces the same text

Not for this skill when

• generic mobile release fails with a different message and none of the signals here appear
• Nothing has failed yet and you are doing first time setup or general planning
• Every service from this vendor is down for all users, which is a vendor outage to wait out first

Steps

1. Reproduce the failure once in the store portal, the CI job log, and the release build output and search the log or history for the exact text in the block above, recording the time, the workspace or project, and the one object it names. Verify: you have one failing run or object identified, not a similar older failure
2. Inspect the build signing, the store metadata and declarations, the version and build number, and the track or rollout the release targets, and check the symbolicated release stack trace, the release configuration for the named component, and a release build retest on a physical device class. Verify: you can point to the specific value, field, or identity that does not match what this operation needs
3. Apply the fix at that source: reproduce on the release build itself, read the symbolicated release crash or log for the named component, and fix the release configuration or dependency version that debug builds do not exercise. Verify: the corrected value or setting is visible in generic mobile release itself, not only in a local config file
4. Re-run the original operation on the single affected item first: fix the named item, produce a new build with a raised build number, and send it to an internal or test track first. Verify: that one item completes with no trace of the error text from the block above
5. Check the downstream result a user or the next job would see: the test track build processing cleanly and the store page showing the corrected version ready to promote. Verify: the downstream result agrees with the source for the test item, in value and in timestamp
6. Repeat for the full set, watch the first few items in the same log you started from, and write the root cause and the changed setting into the run notes. Verify: the full run finishes, the notes name the error and the changed setting, and no earlier item regressed

Variant phrasings

Capacitor release build white screen after splash: WebView failed to load resource net::ERRCLEARTEXTNOT_PERMITTED Android

The subject-first phrasing of the same failure. The fix is the same, start at step 1 and confirm the object the log names.

generic mobile release net::ERRCLEARTEXTNOT_PERMITTED during the run

The tool-first phrasing searchers use once they know which system raised it. It is the same underlying problem, not a separate bug.

Why does capacitor release build white screen after splash: WebView failed to load resource net::ERRCLEARTEXTNOT_PERMITTED Android keep happening after a retry

The repeat-occurrence phrasing. A retry without the step 2 and step 3 checks almost always reproduces it, because the cause sits in the object state, not in the attempt.

Compatibility: Xcode 15 or 16 or Android Studio current releases, fastlane or store direct upload, App Store Connect and Play Console. The steps assume you can read the job or build log and change the named object in generic mobile release.

Why it happens

In generic mobile release, this failure usually means the release build behaves differently from the debug build because release only configuration, shrinking, or network rules change what ships. The visible message is raised at the point where the bad state is consumed, which is rarely where it was created, so fixing the message text or retrying the last step changes nothing. Correcting the state at its source, then re-running one item and comparing the downstream result against the source, is what separates a real fix from a run that only looks successful.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_ZX7YccgjXee4gv0QlTzSFg

Resolved from the public thread: https://vectle.com/posts/pst_ZX7YccgjXee4gv0QlTzSFg

Thread query: Capacitor release build white screen after splash: "WebView failed to load resource net::ERRCLEARTEXTNOT_PERMITTED" Android

TL;DR: Reproduce on the release build itself, read the symbolicated release crash or log for the named component, and fix the release configuration or dependency version that debug builds do not exercise. Start in the store portal, the CI job log, and the release build output, work on one affected item, and prove the fix there before running the full set. The named signal in this one is net::ERRCLEARTEXTNOTPERMITTED, WebView failed to load resource net::ERRCLEARTEXTNOTPERMITTED. Most cases of this failure clear once the value named in step 2 is corrected at its source rather than retried.