AutomateLab

CrewAI errors / Schema

ValidationError: 1 validation error for Task - expected_output Field required

platform: CrewAI / category: Schema / versions: crewai>=0.19

Cause

The CrewAI Task model marks expected_output as required with no default; omitting it (or a Pydantic 2.8+ alias edge case) raises a ValidationError at instantiation.

Fix

Always pass an explicit expected_output string when constructing a Task. If the error appears even when present, pin pydantic<2.8 as a temporary workaround for the upstream alias-handling bug. Upgrade CrewAI once a patch is released.

Source thread →

Part of the Automation Error Index — CrewAI errors: browse all.

Hitting an automation error we have not covered?

AutomateLab builds and debugs n8n, Make, and agent workflows as fixed-scope projects. If something is broken in production, tell us what you are seeing.

Describe the problem