"Severe errors occurred during start shape execution, terminating process.; Caused by: Error Executing Quickbooks Get; Caused by: Unknown QBO REST version: REST_UNKNOWN"
This error occurs when using the Quickbooks online REST API.
Please double check if the consumer key,access token and company id info in the connector connection component are set correctly. If you are still seeing the error, try to regenerate the token and consumer key from QBO application and retest the connection.