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[Azumazon]

So I try to launch my favorite MOD tonight and get this weird error.

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Engine Error
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MountFilesystem( 317 ) failed:  SteamMountFilesystem(4276,317,0x1ab2f638=,0x1ab2f528) failed with error 116: Cache needs repair
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OK   
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Searched and everyone said that you need to verify the game files along with SDK 2007 I was able to on SDK, but not on GE:S.  Is there a way to do this on the mod?  I have some crash logs, but I have to figure out something for the upload if that would be helpful.

[major]

I'd suggest just uninstalling and reinstalling GE:S. Backup your 'gamestate.txt' if you want to keep your achievements.

'gamestate.txt' is located in 'Program Files\Steam\steamapps\sourcemods\gesource'

Someone might have have a better fix, but that should also do the job.

Could possibly try checking Hl2:EP2 cache if you have that installed.

Verify SDK 2007 Cache.

[killermonkey]

This means your SDK 2007 files are corrupt. You need to go into the properties of the SDK and "verify game cache".

GE:S does not have any game cache files, therefore it is impossible for this to be the mod's fault. Your steam files are corrupted.

[Kratos]

This means your SDK 2007 files are corrupt. You need to go into the properties of the SDK and "verify game cache".

GE:S does not have any game cache files, therefore it is impossible for this to be the mod's fault. Your steam files are corrupted.

^ Killermonkey knows his shit well! Don't ignore every detail.

[I8PP]

I have the same problem, except it mentions MountFilesystem( 421 ).

I verified integrity of tool cache of SDK 2007, and tried reinstalling it, but no dice.

[major]

Verify integrity on HL2:EP2.

421 is Hl2:EP2's Steam Application ID

[FReXx]

Verify integrity on HL2:EP2.

421 is Hl2:EP2's Steam Application ID

I had the same problem yesterday and actually just execute Half Life 2 Episode 2 solve the problem.

[VoidViper]

Verify integrity on HL2:EP2.

421 is Hl2:EP2's Steam Application ID

How do I exactly do that, because I do not own EP 2 and it does not specify that golden eye needed HL2:EP2.... i recently found about the mod and I want to try it out but that's a real pain and i can't seem to find any solution whatsoever :/

[Troy]

I have the same problem, except it mentions MountFilesystem( 421 ).

I verified integrity of tool cache of SDK 2007, and tried reinstalling it, but no dice.

The 421 error is different than his.

-Exit out of STEAM completely
-Go into the sourcemods folder
-Go into GE:S folder
-Find the file named gameinfo.txt
-Open that file and delete the sentence
"AdditionalContentId 420"

[Wishful Thinking!]

I have been having this problem for a couple of weeks now, however I have come across this thread and have done as you said Troy, and now it works like a charm, Thank you.