Error message when linking library

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I get an error message with the few code of var rpg = Gir.load('rpg', '0.3'); Nevertheless I can use my library.

** (process:17727): CRITICAL **: g_irepository_find_by_name: assertion `typelib != NULL' failed

** (process:17727): CRITICAL **: g_irepository_find_by_name: assertion `typelib != NULL' failed

** (process:17727): CRITICAL **: g_interface_info_get_n_prerequisites: assertion `GI_IS_INTERFACE_INFO (info)' failed

** (process:17727): CRITICAL **: g_interface_info_get_n_methods: assertion `GI_IS_INTERFACE_INFO (info)' failed

** (process:17727): CRITICAL **: g_irepository_find_by_name: assertion `typelib != NULL' failed

** (process:17727): CRITICAL **: g_irepository_find_by_name: assertion `typelib != NULL' failed

** (process:17727): CRITICAL **: g_interface_info_get_n_prerequisites: assertion `GI_IS_INTERFACE_INFO (info)' failed

** (process:17727): CRITICAL **: g_interface_info_get_n_methods: assertion `GI_IS_INTERFACE_INFO (info)' failed

** (process:17727): CRITICAL **: g_irepository_find_by_name: assertion `typelib != NULL' failed

** (process:17727): CRITICAL **: g_irepository_find_by_name: assertion `typelib != NULL' failed

** (process:17727): CRITICAL **: g_interface_info_get_n_prerequisites: assertion `GI_IS_INTERFACE_INFO (info)' failed

** (process:17727): CRITICAL **: g_interface_info_get_n_methods: assertion `GI_IS_INTERFACE_INFO (info)' failed