Unable to activate windows store app the app didn't start

First of all I would like to say that I already tried all the solutions I could find on the internet, including Unable to Activate Windows Store App

I recently upgraded my Windows 7 machine to Windows 8.1 to be capable of developing Windows Store apps using Visual Studio 2013. When I open a blank project (Windows Store -> Blank App) and run it I get this error:

Unable to activate Windows Store app 'Package Name'. The App1.exe process started, but the activation request failed with error 'The app didn't start'.

See help for advice on troubleshooting the issue.

I already tried:

Reinstalling Windows (Clean install)
Reinstalling Visual Studio 2013
Installing Visual Studio 2012 (same error)
Deleting "bin" and "obj" folder
Cleaning the solution
Uninstalling the app from start menu
Creating a new project
Acquiring the license multiple times (the license is valid)
Making sure that app.config doesn't exist
Investigating the Windows Event Log which says

Activation of the app 'Package Name' for the Windows.Launch contract failed with error: The app didn't start..

but found nothing useful

Adding a new Windows user
Run everything as administrator
and at last, changing the desktop background

None of this did bring a solution. Does anyone have an idea what else could be the reason for this error?

Solution

I found a solution. The problem was that the drive I was working on was encrypted (TrueCrypt). Moving the output folder to an unencrypted drive solved the problem.