# M0153

This error means that an imported Candid file (`.did`) mentions types that
cannot be represented in Motoko. These are

* `float32`
* `service` types with method names that are not identifiers, e.g. because
  they contain special characters.

If you encounter this error, and you can, you should avoid these types in the
service’s interface. If you have no control over the interface, you cannot
interact with it from Motoko.