You also didn't add any modules that might contain widgets? And did you already try to clean up the deployment directory via Menu > Project > Cleanup Deployment Directory?
Hi friends, even i got the same issue, but then as Mitchel Mol told, i cleaned my deployment directory and restarted the system, then it came to the normal and executing without any errors.
What worked for me is ... Deleting the whole directory "deployment" from ur Mendix project directory( C:\....\... MendixProjectName >deployment) . And then re-run ur application.
In my case, killing tsvncache.exe did the trick. I found the culprit using Process Explorer (from Microsoft Sysinternals) and search for the name of the folder that contains my Mendix projects. See also https://serverfault.com/a/1980.