Comes up when I hit ‘Run’ or ‘Play’. Never seen this in the 5 years I have been on ROBLOX.
http://gyazo.com/b225fa568270345e0f36350098285e0e
This is an installation issue; we introduced a bug in our updater that causes this 
You can fix it by closing the browser, removing the Versions folder from C:\Users\YourUserName\AppData\Local\Roblox, reopening the browser and playing any game (that would reinstall ROBLOX player and Studio)
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