Demisto playbook error "script failed with exit code 1" alert triage broken

Not specified by the original author.

TL;DR

Fix this in the Demisto playbook by acting on the exact message first: open the failed task output in the playbook run, read the first failing input (usually a missing or null argument from the previous task), fix that input mapping, and pin the script version the playbook was tested with. Do not rerun the whole job unchanged, because the same inputs produce the same failure. Prove the fix on one item, then rerun the full scope and reconcile the counts.

script failed with exit code 1

Use this when

• The operation in the Demisto playbook fails with this exact message: script failed with exit code 1.
• The same failure repeats on retry with unchanged inputs.
• A review, export or check is blocked until this item completes.

Not for this skill when

• The message is a permission or outage notice from the platform. Resolve that first, then return here if this error remains.
• The operation completes and you only disagree with its output. That is a quality review, not this failure.

Steps

1. Reproduce the failure with the smallest scope that still shows it in the Demisto playbook, and copy the full message plus the alert, incident or enrichment record involved into the run notes. Verify: the error is reproduced on demand with a named item, not only seen in a log.
2. Apply the specific fix for this error: open the failed task output in the playbook run, read the first failing input (usually a missing or null argument from the previous task), fix that input mapping, and pin the script version the playbook was tested with. Verify: the playbook runs end to end on a test alert with no failed tasks.
3. Check the neighbouring items that share the same config, template, feed or credential, because this class of failure rarely affects only one item. Verify: the neighbouring items are listed and each is marked affected or clear.
4. Compare the result counts, decisions or alerts against the source in the Demisto playbook so a silent partial success is caught before sign off. Verify: counts match the source or every difference is named and explained.
5. Rerun the original operation in the Demisto playbook on the previously failing scope, watching for the same message rather than assuming success from a quiet log. Verify: the operation completes and the original message does not appear.
6. Record the fix, the triggering input and the verification result on the item so the next occurrence is recognised immediately. Verify: the record names the error, the fix applied and the evidence of success.

Why it happens

the script received input it cannot handle from an upstream task and exited at the first bad value, which stops the whole triage flow.

Variant phrasings

script failed with exit code 1

The verbatim form searchers paste from the terminal or console. Treat it identically: same fix, same single item proof, then the full rerun.

How to fix: Demisto playbook error "script failed with exit code 1" alert triage broken

The how-to phrasing for the same failure in the Demisto playbook. The steps above apply unchanged; start at the reproduction step rather than skipping to the rerun.

the Demisto playbook troubleshooting for this failure

The symptom-first phrasing used when the console hides the full message. Surface the full message first, confirm it matches the code block above, then follow the steps.

Compatibility: the Demisto playbook at current versions, plus the platform API or console the query names; no extra tooling beyond a text editor and the source system access needed to verify counts.

Provenance

Resolved from the public thread: https://vectle.com/posts/pstEF5pApM6FUcnZz5nWnPng

Resolved from the public thread: https://vectle.com/posts/pstEF5pApM6FUcnZz5nWnPng

Thread query: Demisto playbook error "script failed with exit code 1" alert triage broken

TL;DR: Fix this in the Demisto playbook by acting on the exact message first: open the failed task output in the playbook run, read the first failing input (usually a missing or null argument from the previous task), fix that input mapping, and pin the script version the playbook was tested with. Do not rerun the whole job unchanged, because the same inputs produce the same failure. Prove the fix on one item, then rerun the full scope and reconcile the counts.