Websphere error WSVR0101W

If you ever get an error like this:

0000006d ApplicationMg A WSVR0200I: Starting application: MyAppEAR
0000006d ApplicationMg E WSVR0101W: An error occurred starting MyAppEAR
0000006d ApplicationMg A WSVR0217I: Stopping application: MyAppEAR
0000006d ApplicationMg A WSVR0220I: Application stopped: MyAppEAR

Make sure your web.xml is correct. In our case, we had some unexistent servlet mapping, which caused the application to fault.