| ERROR | no new operations allowed until the active operation ends |
| CAUSE | An attempt was made to execute a new operation before the active non-blocking operation completed or a new operation was attempted before all the pieces of a column were inserted or fetched. |
| ACTION | Execute the new operation after the non-blocking operation completes. If piecewise binds/defines were done, execute the new operation after all the pieces have been inserted or fetched. |