Unable to automatically debug "xxxx". Attaching to the server process failed. Mixed mode debugging is not supported on Windows 64-bit platforms.

Question

We are getting the above error when we try and run our tests in debug mode.

We have a .net solution written in C#, which we have developed using Visual Studio 2008 on Windows XP.

We have now got new machines :). Windows 7 64 bit.

The solution has several wcf host and web services host, it also runs some windows workflows.

It appears that it is trying to stop at a break point in the code, in other places it stops and asks if it should break.

Question is:

• Why is this happening for only some dll's / services?
• Can I configure it to not break on error, but just fail the test and keep going?

Answer 1

I got rid of this error by adding the following to my config (app.config or web.config)

<system.web>
  <compilation debug="true" />
</system.web>

A bit more info here.