[Koha] Still we did not succeed in using KOHA for our libraries

Hi all, We, the Addis Ababa University Libraries, have still problems with KOHA 2.2.0. We have configured KOHA 2.2.0 on Linux platform - Redhat 9 Professional Edition on a Dell PC of high capacity. Some of the links in the Circulation module do not work properly: ISSUE and RETURN, editing member data, etc. Whene you click the link buttons you will see Error 500. Similarly, the OPAC module could not search books entered during cataloging. Can anybody help us on the problem. Is there a problem of using Koha 2.2.0 on Redhat 9 Professional Edition? Thanks, Yohannes Mulugeta Addis Ababa University Libraries http://www.aau.edu.et/libraries/ Addis Ababa, Ethiopia