Hi, I am using zencart version 1.3.8a. After installing the module_manager rev 18, I installed SSU version 3.5.8
When I clicked on admin>extra>SSU Manager, a fatal error appeared as followed:

Fatal error: Class 'yclass' not found in /home/yourprec/public_html/mono/ssu.php on line 16

Can I know how to fix this? I have studied some post regarding 'yclass' but I still do not understand what should be done.

Thank you