Out of Date Module or Addon
This typically happens when you either don't have our AtlasVR module/addon installed or have not updated it.

How to Fix
1 - Goto this link
2 - Click on the Code button
3 - Click Download ZIP
4 - While that downloads goto Steam
5 - Find Garry's Mod and right click
6 - Select Properties
7 - Select Local Files and click Browse
8 - Inside of the AtlasVR folder upload the garrysmod folder
9 - You're ready to go!
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