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Make errors / Config

[400] Invalid JSON payload received. Proto field is not repeating, cannot start list.

platform: Make / category: Config / code: 400

Cause

A multi-value array is passed to a Google API field that expects a single object, so the serializer emits a list the proto definition forbids.

Fix

Open the module and check each field is not receiving a mapped array variable. Use a Text Aggregator or join() to flatten multi-value inputs to a single string before mapping. If intermittent, add an Ignore/Resume route to log the problematic bundle.

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