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Version: 10.3

Invalid Asset File Error

Symptoms​

You may encounter the following:

  • Dagster logs contain InvalidAssetFileError.
  • Asset discovery stops while processing YAML files.

System Behavior​

Dagster raises an InvalidAssetFileError and skips loading the affected asset definition.

Possible Causes​

This issue may occur because of one or more of the following conditions:

  • Invalid YAML syntax.
  • The YAML root element is not a mapping structure.

Resolution​

Fix the YAML file​

  1. Identify the affected YAML file from the Dagster logs.

  2. Open the file using a text editor that supports YAML formatting.

  3. Review the file for:

    • Invalid indentation
    • Missing colons
    • Incorrect spacing
    • Missing quotation marks
    • Unsupported characters

  4. Verify that the YAML file uses a valid top-level mapping structure.