| A field `Descriptor` was created by mixing the message `Descriptor` from one | |
| proto message with the field number from another. For example: | |
| ```java | |
| Foo.getDescriptor().findFieldByNumber(Bar.ID_FIELD_NUMBER) | |
| ``` | |
| This accesses the `Descriptor` of a field in `Foo` with a field number from | |
| `Bar`. One of these was probably intended: | |
| ```java | |
| Foo.getDescriptor().findFieldByNumber(Foo.ID_FIELD_NUMBER) | |
| Bar.getDescriptor().findFieldByNumber(Bar.ID_FIELD_NUMBER) | |
| ``` |