| ERROR | invalid use of aggregate operator for a noncollection event |
| CAUSE | An attempt was made to specify an aggregate operator on an event that is not identified as collection. |
| ACTION | Correct the input and try again. |
| ERROR | invalid use of aggregate operator for a noncollection event |
| CAUSE | An attempt was made to specify an aggregate operator on an event that is not identified as collection. |
| ACTION | Correct the input and try again. |