Cubase5 Version 5.0.1 Build 147 problem

Hi i have a problem with cubase 5 !
Recently i have a project who don’t want to open, in error say to open the log file from cubase folder and send to cubase suport.

The error is :

Cubase5.exe Version 5.0.1 Build 147 - 7.3.2011 17:55

Timestamp is 49caa93f (Wed Mar 25 23:59:27 2009)
C:\Program Files\Steinberg\Cubase 5\Cubase5.exe

Exception code: C0000005 ACCESS_VIOLATION
Fault address: 670FBE63 01:000FAE63 C:\Windows\system32\QtCore4.dllBytes at CS:EIP:
48 8b 80 88 00 00 00 48 85 c0 74 09 49 8b d0 49
8b c9 48 ff e0 48 8b 01 48 ff 60 60 cc 48 83 ec