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Troubleshooting Model Failure Messages

Please find a list of model errors that might appear in the Job Error Log and their associated resolutions.

Error – Preprocessor run failed: not enough values to unpack (expected 2, got 1)

Resolution – Please check to see if a scenario item was built where an action does not reference a column name. Scenario Actions should be of the form ColumnName = …..

scenario error 1

scenario error 3

Error – Preprocessor run failed: unterminated string literal (detected at line 1)

Resolution – Please check to see if there is a string in the scenario condition that is missing an apostrophe to start or close the string

scenario error 4

scenario error 5

Error – sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) connection to server at “DB_NAME” (, port 6432 failed: SSL SYSCALL error: EOF detected

Resolution – This indicates an intermittent drop in connection when reading / writing to the database. Re-running the scenario should resolve this error. If the error persists, please reach out to

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