Help on building midlet error

[Harry Waite]

I got this error, when executing midlet suite using Nokia 7210 emulator integrated in Nokia Developer Suite with Sun ONE Studio 4 Mobile Edition:
Preverifier Error:
JAR file creation failed with error -1
The preverified classes if any are in tmp41.
Also when I tried to "create package" using Nokia Developers Suite, I got the same error.
Why I got that error? Anyone know any workaround?
Thank you.