| ERROR | MAP methods must return a scalar type. |
| CAUSE | The MAP member function was written such that it returns something other than a scalar type. |
| ACTION | Rewrite the MAP function such that it returns a scalar type. |
| ERROR | MAP methods must return a scalar type. |
| CAUSE | The MAP member function was written such that it returns something other than a scalar type. |
| ACTION | Rewrite the MAP function such that it returns a scalar type. |