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Sometimes the "theme" and "lang" fields in the user and course tables in the database are set to incorrect values (uninstalled or non-existent themes and language packs). This makes Web Services functions to fail because the WS server validate the returned data using the validate_param function that clean parameters.
ENROLMENT MODULES ----------------- (Yes, that's the correct English spelling ;-) ) All enrolment modules must extend base class enrol_plugin which is defined in lib/enrollib.php. You can find documentation of each method in the base class.