Call to a member function on a non-object

HI, I used my scripts yesterday and suddenly today they dont work and I get this error: Call to a member function on a non-object it points to erroneous line that calls a function in 1 of my classes. The class and this particular file have not been changed since i used them yest. I also checked my DB and all is perfect. I read somewhere on the net that it could have something to do with cache. But i couldnt find any helpful info. perhaps someone has experienced this error before and what could cause it and how do i fix it? thanx in advance Angelo -------------------------------------------------------------------- Disclaimer This e-mail transmission contains confidential information, which is the property of the sender. The information in this e-mail or attachments thereto is intended for the attention and use only of the addressee. Should you have received this e-mail in error, please delete and destroy it and any attachments thereto immediately. Under no circumstances will the Cape Technikon or the sender of this e-mail be liable to any party for any direct, indirect, special or other consequential damages for any use of this e-mail. For the detailed e-mail disclaimer please refer to http://www.ctech.ac.za/polic or call +27 (0)21 460 3911