Unhandled Expression - While playing downloaded games - Motorola i870

Greetings-

I own the Motorola i870 phone and I downloaded several games and transferred
them
into my phone.

It seems like I get the error 'Unhandled Expression' a lot when playing them
and it crashes the game.

I read on one forum to highlight Java Settings and hit Menu button and to
Reset System but this didn't work they still crash.

Anything else I can try? I was getting into Forsaken Fortress and it keeps
crashing.

Thanks
VastFear