Module file cannot be loaded, not a shared library perhaps
Module has not registered plugin type, library is not an anjuta plugin or not for the right version
Module does not contain registration function, library is not an anjuta plugin or is not for the right version
Module file location is missing in .plugin file
Module file name not found, plugin module is probably not installed
Plugin type (just after double colon following location) is missing in .plugin file
Another error
These enumeration is used to specify errors.