Hammer wont launch (gameinfo.txt is missing)

Capp

L4: Comfortable Member
Jan 20, 2017
167
28
Suddently, when trying to start hammer, it refuses to open and shows the message: Team fortress 2\hl2\gameinfo.txt is missing.

I checked and it really is missing. What exactly am i supposed to do so i can fix this? Please answer.
 
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