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Try doing what the comment says below it to try to get it to work.
Okay will this is how you VALIDATE your L4D2 files. you need to go to your LIBRARY and RIGHT CLICK on L4D2 and select the PROPERTIES option, then from there click on the LOCAL FILES TAB in the new window and selcect the VERIFY INTRGEITY... Option. THis should take like 20 minutes becasue the program is checking all your L4D2 files to make sure nothing was accidently deleted or moved and if it finds a missing file it will redownload that file. Dont worry it wont delete andything it will only download missing files.