When I try to add external functions to a web service.
I get these errors.
Can anyone direct me about what this error/s is about.
Any plugin that is missing or some missing files
Coding error detected, it must be fixed by a programmer: Cannot find file with external function implementation
line 87 of /lib/externallib.php: coding_exception thrown
line 199 of /admin/webservice/forms.php: call to external_api::external_function_info()
line 204 of /lib/formslib.php: call to external_service_functions_form->definition()
line 60 of /admin/webservice/service_functions.php: call to moodleform->__construct()