Mine doesn't work either!
Error on Mobile Chess: NumberFormatException

For a quick fix even though I know it is tedious. Try uninstalling the mobile app completely from your mobile and then reinstall it.

I have the same problem. At the beginning, version2.0 worked well, and now the same error shows up. Reinstalling didn't help. It's quite a pity because I have several fast paced games going, for which if I didn't get to computer on time, I used to make moves via mobile, but now I'll probably have to take vacation in order not to time out... Could someone from the staff inform when this will be fixed?

Do not reinstall. Delete first and then install
I tried that and it still did not fix the issue.
I use Mobile Chess regularly, and I am very happy with it. I often use the 25 moves per day limit of my membership level.
I upgraded to version 2.0 and for a while, it worked fine. I was able to play, use Analysis board and so on.
But since yesterday afternoon I got the following error when I try to open a game, either a pending or a no pending one:
Application Error
Number Format java/lang/NumberFormatException 12414873060991241517689818
After that the application closes. The error is permanent, and occurs 100% of the time. I did not report before because I understand you people have just released so many new cool features.