Platform Builder error - "The entered path is not a valid build tree path"

I've been struggling with this for the past few hours till I found a post on the Windows CE base team blog which explains the causes for this error and possible solutions.

http://blogs.msdn.com/b/ce_base/archive/2005/09/15/467609.aspx

The method that I used to solve this is to use a custom build tree used in my company. Reinstalling Platform Builder without using the "Tools only" options might also fix this error.


Apparently you cannot use the WM500 image in Platform Builder 5.

A bit more information I just learned today. Technically speaking Windows Mobile 5.0 is a "tools only" Platform Builder install with the Windows Mobile command line build system. So a full install of WM still counts as "tools only." I guess that means you cannot build a WM image from inside Platform Builder, and must instead use the command line. (?) 

So one would have to use a valid build tree or use the command line.