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Source SDK - Create a mod not working

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hi im trying to create a mod for hl2 but every time try to load up a map i get this MountAppFilesystem() failed: SteamMountAppFilesystem(215,35,0x821fd24) failed with error 21: A different version of this FS is already in use any one no what i can do to stop it

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Normally, for a specific engine or toolkit, you should first check the website for that engine/toolkit. For example, I just checked Valve's Developer Wiki for your error, and found this: Known Issues in Source SDK. That describes your problem exactly, and offers the solution to it.

Failing that, you can always google your error, and get results faster than we can answer you, saving you some time, and saving you the trouble of registering for the forum. (But if you can't find any answers by googling, then by all means ask us, we're very willing to help. Just try to make an attempt to help yourself before asking others to help you; it saves you time, and helps you learn.)

In any case, I hope the link above solves your problem. [smile]

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