Migrating to 5.3.1 - http error 404 when running a project

I have succesfully migrated an existing project from BM 5.2.0 to 5.3.1. I can run it in the sandbox (that is, I see my project icon in the Launchpad). But, when I try to run it I get an http 404 error. A smaller MyFirstApp I do can run/view succesfully in the sandbox. Reviewing some older questions (9-5-2012) it seems to be caused by a limitation of the maxRequestLength and/or maxallowedcontentlength within the ASP.NET rewriter module??? The mpr of the MyFirstModule project is 0.5 Mb. The mpr of the project I want to migrate is 10.3 Mb, so far larger then the 4 Mb mentioned as maxRequestLength in http://msdn.microsoft.com/en-US/library/e1f13641(v=vs.80).aspx for the httpRuntime element. My questions are: - has it to do with a limit in using the sandbox? - what is the actual solution / workaround for this?
1 answers

Could it be that it tried to open the project in the cloud instead of local? Did you already publish your application to your cloud node?