I got the above error in VS 2008 with a web project in localhost while I put a breakpoint. It used to work fine and suddenly happened yesterday. I deleted BIN folder and added all references from scratch. I also deleted solution file and recreated project. I rebooted the machine also. I checked the build is debug mode and used rebuild all several times. Googled around but still can not figure it out. I searched disk, can not find any PDB files. Strange enough, some files can be debugged (in same folder with same extension). If I put System.Diagnostics.Debugger.Break() at the line, VS does break into debug mode, so the line of code is reachable.
what else could I try?