VixDiskLib_Open exception at ESXi4.1

HI all,

I got a program when using VixDiskLib_Open try to open ESXi4.1 vmdk , but my program got exception and exit , no VixError return.

I use VDDK 5.1  , any idea ? and i use some days to search the solution ....

vixError = VixDiskLib_Open(tESXConnection, vDiskPath, VIXDISKLIB_FLAG_OPEN_READ_ONLY, &tESXDiskHandle);