[Help]Lattice ispVM download 'Failed in Function VERIFY_USERCODE'

[Solved]Lattice ispVM download 'Failed in Function VERIFY_USERCODE'

I have a brand new ispMACH4256ZE Breakout Board Evaluation Kit.

https://www.latticestore.com/produc...hid/1/searchvalue/lc4256ze-b-evn/default.aspx

It is my first time to download demo file 'lc4256ze.jed' onto it, but failed.

Below are error messages:
------------------------------------------------------
04/30/14 23:52:20
Check configuration setup: Start.

04/30/14 23:52:20
JTAG Chain Verification. No Errors.

04/30/14 23:52:20
Check configuration setup: Successful.

04/30/14 23:52:20
Device1 LC4256ZE: Erase,Program,Verify


Frequency setting= 15000000 Hz

Frequency setting= 15000000 Hz

--------------Row95--------------:
HDR 0
TDR 0
SDR 32 TDI(FFFFFFFF)
Expected TDO(FFFFFFFF)
Received TDO(00000000)
Bits Error 0032: Expected: 1 Received: 0
Bits Error 0031: Expected: 1 Received: 0
Bits Error 0030: Expected: 1 Received: 0
Bits Error 0029: Expected: 1 Received: 0
Bits Error 0028: Expected: 1 Received: 0
Bits Error 0027: Expected: 1 Received: 0
Bits Error 0026: Expected: 1 Received: 0
Bits Error 0025: Expected: 1 Received: 0
Bits Error 0024: Expected: 1 Received: 0
Bits Error 0023: Expected: 1 Received: 0
and more...
Execution time: 1.65 seconds

04/30/14 23:52:22
Failed in Function VERIFY_USERCODE

04/30/14 23:52:22
Process Operation Failed.

Elapsed time: 02 sec

-------------------------------------------

Any advice is highly appreciated, many thanks in advance.
:-?

I solved it by ticking option 'Enable Debug Mode' in the device information dialog, but I do'nt know why.