Faint for JCOP error message T_T

In my Applet I need to use the class OwnerPIN. When I call OwnerPIN's method

boolean check(byte[] pin, short offset, byte length)

the console window shows:

ASSERTION FAILED! Constant exceeds range: 0x0/0 <= 0xFFFFFFFF/-1 < 0x100/256

File: vm.c

Line: 965

In my mind, whatever I wrote, an JAVA error or exception will be thrown out. But now ...

my JCOP tools version: 3.1.1.a

Simulator using: Generic JCOP41v2.2

I'm afraid some unknown error will happen in JCOP RealCard.

Thanks~

[554 byte] By [Realsomea] at [2007-11-26 12:58:59]