World of WarCraft: Assertions Enabled Build (build 10048)

Exe: C:\Users\Public\Games\World of Warcraft Public Test\WoW.exe
Time: Sep 11, 2009 6:14:44.503 PM
User: Jeffrey
Computer: JEFFREY-PC
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This application has encountered a critical error:

ERROR #0 (0x85100000) Assertion Failure
Program: C:\Users\Public\Games\World of Warcraft Public Test\WoW.exe
File: .\ShaderEffectParser.cpp
Line: 69
Expr: argC


I was marily minding my own business. When it happened, an error popped up and I was not able to play. This happens any time I try to staert up the PTR and I'm getting tired of it, I ran WoW repair and still no luck. Please help! Thanks!