log error

Author: dandavison

temporalio/worker/_workflow.py

@@ -138,6 +138,7 @@ def __init__(
                 else:
                     unsandboxed_workflow_runner.prepare_workflow(defn)
             except Exception as err:
+                logger.error(f"Error preparing workflow {defn.name}", exc_info=err)
                 raise RuntimeError(f"Failed validating workflow {defn.name}") from err
             if defn.name:
                 self._workflows[defn.name] = defn