General plugins

Hi,
I have the same problem. I am running Moodle 2.7.8 with reservation module 2.7 release 2015031101.

When I turn on the debug, I receive the following message:

"Fatal error: Call to undefined method mod_reservation_mod_form::standard_intro_elements() in /DIRROOT_OF_MY_MOODLE/mod/reservation/mod_form.php on line 32 "

Did you already solve this problem?

Thanks in advance fon any help

Sara