Hello
Just to check, the .dll files have to be copied to the BIN folder of the deployed web site on the production server. Is that already the case?
of course.
just to make it clear.
if we replace all dll's in the bin folder with all the new depolyed version everything works fine.
we only get the error during the patch
A similar issue was reported, so you might take a look: http://forums.asp.net/p/1006957/1337362.aspx#1337362
I vaguely remember seeing an error like this when I tried removing one of the .compiled files to see what would happen. Maybe it is related to that file?
You could try the suggestions in that post to see if you can narrow down which files are causing the problem.