Could not load file or assembly 'xxx' or one of its dependencies. An attempt was made to load a program with an incorrect format
<p>I just checked out a revision from Subversion to a new folder.  Opened the solution and I get this when run:</p>

<p><strong>Could not load file or assembly 'xxxx' or one of its dependencies. An attempt was made to load a program with an incorrect format.</strong></p>

<p>This is the same code I had checked in a while ago.  Why now is it doing this?  I now also see a Debug x86 instead of just Debug in that xxx project's bin folder.  What is Debug x86 and why don't I just have Debug only like I used to in the bin folder?</p>
