Hey, I get this message after attempting to render.

Problem Description
Application Name: Vegas Pro
Application Version: Version 9.0 (Build 562) 64-bit
Problem: Unmanaged Exception (0xc0000005)
Fault Module: C:\Program Files\Sony\Vegas Pro 9.0\FileIO Plug-Ins\mcmp4plug\mcmp4plug.dll
Fault Address: 0x00000000341520E5
Fault Offset: 0x00000000000020E5


Fault Process Details
Process Path: C:\Program Files\Sony\Vegas Pro 9.0\x86\FileIOSurrogate.exe
Process Version: 1.0.0.1
Process Description: Sony File Interface Surrogate (not visi
Process Image Date: 2009-04-16 (Thu Apr 16) 17:55:24

Anyone know what it means?