BB5 dejan problem

Im trying to unlock a bb5 phone using dejan software.

Im following all steps below and have the correct cable.

But when i get to step 4 i get this meesage
"Windows cannot access the specified device, path, or file. You may not have the appropriate permission to access the item."

Why am i getting thiss message?

phone im trying to unlock is the 6680.

Instructions how to use software:

1. Connect DKU-5 or normal COM cable to computer

2. Set proper COM por cable (must be between port 1 - 9 )

3. Download unlocker software, run INSTALL.BAT

4. Open file c:/bb5_unlocker/logs/bb5_unlocker.cfg and write here pro COM port ( 1- 9)

5. Run c:/bb5_unlocker/BB5logunlocker.exe

6. Click READ PHONE

7. Click MAKE LOG, log will be created

8. Enter codes to phone (in /psw/dir), or

9. Click SP UNLOCK to enter codes via FBUS