W3wp.exe has a debugger attached, but the debugger is not configured to debug this unhandled exception, to debug this exception, you must detach the current debugger.

Before debugging the project by using the VS2010 attach process, today the boot found debugging this machine project error such as:

Looking around the web without fruit, after repeated experiments to find a solution, my project is published to IIS

1. First delete the items above IIS

2. In the VS right-click Project--Properties->web-> Click Create virtual directory (i.e. recreate one)

Ok problem solved, this problem toss me 2 hours, tried a lot of methods such as re-register the framework, restart IIS, restart the computer and other ways, are not good use, fortunately found a solution, to commemorate a bit, hope to help more people.

W3wp.exe has a debugger attached, but the debugger is not configured to debug this unhandled exception, to debug this exception, you must detach the current debugger.