Attempt to deleted user failed

[J35M8]

Any hints would be most appreciated
0 Too few arguments to function PlgSystemUserxtd::onUserBeforeDelete(), 1 passed in /mnt/data/vhosts/casite-1028575.cloudaccess.net/httpdocs/libraries/joomla/event/event.php on line 70 and exactly 4 expected

[aigurus]

Seems this is a dead project. I have removed almost severa errors and once I check everything I will upload it into Joomla.