Thread:Project:Support desk/Fatal exception of type MWException (5)/reply (6)

The error message shown in my previous post is the one prior to the test where I've tried the monobook skin replacement. I thought that upward compatibility was supported (since it is frequent that old versions of files are read with new versions of soft).

If you have an idea to solve this problem I would really appreciate your help since I really need to upgrade mediawiki to use some extensions not compatible with my current version.