HL1 Engine Steam error

Whenever I try to play a game using the Half Life 1 engine, a fatal error comes up that says 'Failed to initialize authorization interface. Exiting...'

Does anyone have a solution?

After Google'ing a bit, I found this: Link removed (Illegal link ;))

I have no idea if it has a solution for you, but give it a try. Good luck! ;)

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EDIT:

Try using Google a bit.