To fix this please go to the project settings > framework, disable build tools and then save, enable build tools then save. This should bring you up to speed. Not sure how your project got out of sync.
I wonder if one of your colleagues upgraded it locally but you guys don't check in your .sencha directory (which is the recommended way). This could result in Architect thinking you're project has been upgraded when in fact locally it's still attached to the older 188.8.131.52.
Sencha Architect Development Team
Phil, I see this error as well despite having the build tools disabled. (184.108.40.2066 on MacOS 10.9.2)
Perfection as a goal is a nice idea that can point one in a specific direction. However, since "perfection" is an ever changing (evolving?) and moving target, one must admit that perfection can never be obtained...