| A proto's `Descriptor` was created by mixing the `Descriptors` class from one | |
| proto with the field number from another. E.g.: | |
| ```java | |
| Foo.getDescriptors().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.getDescriptors().findFieldByNumber(Foo.ID_FIELD_NUMBER) | |
| Bar.getDescriptors().findFieldByNumber(Bar.ID_FIELD_NUMBER) | |
| ``` |