Hi everybody, I face the problem,I use proguard to obfuscate
my *jar file and preverify it , but it can't run on actual phone nor emulator.( nokia6255 emulator) on WTK22 console the error show as following

Method............: 482c89c 'com/nokia/mid/impl/isa/ui/MIDletManager.main (static)'
Stack Chunk.......: 51c5b98
Frame Pointer.....: 51c5ba8
Current IP........: 4a0cb07 = 4a0cac0 + offset 71
Previous Frame....: 0
Previous IP.......: 1
Frame size........: 2 (1 arguments, 1 local variables)
Argument[0].......: 51c5e80
Local[1]..........: ffffffff

VM status:
Instruction pointer.: 4a0c0cf (offset within invoking method: 120)
Next instruction....: 0xb5
Frame pointer.......: 51c5c24
Local pointer.......: 51c5c08
Stack size..........: 128; sp: 51c5c44; ranges: 51c5ba0-51c5da0;
Contents of the current stack frame:
51c5c08: 51c54f4 (lp)
51c5c0c: 51c5514
51c5c10: 51c54d8
51c5c14: 1f
51c5c18: 2
51c5c1c: 18
51c5c20: 1f
51c5c24: 482c270 (fp)
51c5c28: 51c5be8
51c5c2c: 51c5c04
51c5c30: 4a0cbcc
51c5c34: 0
51c5c38: 51c5b98
51c5c3c: 49e0fb5 (end of frame)
51c5c40: 51c54f4
51c5c44: 53ac180 (sp)
Execution stack contains 168 items:
51c5e80
ffffffff
482c89c
0
53abda0
1
0
51c5b98
4a2253c
0
ffffffff
0
1
51c55c4
51c557c
0
51c5514
53abd9c
482c8bc
51c5ba8
51c5bc0
4a0cb07
0
51c5b98
4a0ccc7
51c54f4
51c54f4
51c5514
51c54d8
1f
2
18
1f
482c270
51c5be8
51c5c04
4a0cbcc
0
51c5b98
49e0fb5
51c54f4
53ac180

WARNING: [MIDlet] java/lang/VerifyError: MainApp.

p.s. MainApp is Midlet Class

What shoud I do , Please give me for a recommend.