In this case, it's easier to identify the error reading the .log file
In the same folder of the qvw, you should find a .log file with the same name of your qvw.
If it is not there, you need to enable it inside the qvw.
Open your file, go to settings -> Document properties -> General tab -> check generate log file.
Even in the qmc, you can get some details. At the top of your screenshot, on the right, you can click on 'show task details'. It may be some section access problem, etc, but you will get more info in the .log file
Hope this helps,