When compiling a c# program with csc /debug I get the message CS0042: Unexpected error creating debug information file "<filename>" -- "<filename>" file can not be found. The file really does not exist, but the /debug-option should create it. If I copy the *.pdb file from another project and rename it, the compilation works, but not for ever, after some compilations the file gets deleted with the compilation and I end up in the above mentioned error. When compiling with VisualStudio 2005 I have exactly the same problem. Has anybody a hint for me? Thank you Hannes