Hi there DevForum Members, I think I broke some of ROBLOX’s Main Scripts aka Core Features
Help would be apprechiated, thank you.
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This is happening to me as well, the only way in Studio I was able to get it 100% was when I deleted my own player when using Play Solo. Not sure about any other cases where it happens 100%.
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Well, It also happens in ROBLOX Client, I checked via Dev Console 
This is a bug, happening to other people. I really doubt its your fault rather than a problem with Roblox.
Oh, thats weird.
I found about this ‘error’ when I was testing MarketplaceService, aka test-buying gamepasses to see if they work.
Btw, nice name!
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I’m pretty sure this causes a big amount of lag. Be careful with services, only use them when needed.
Also thanks! 
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What you’re seeing is an error being spit by the new topbar UI. Roact is a UI library that Roblox and various developers use to program UI functionality.
This is happening for everyone, and was not caused by you.
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Thank you for letting us know!
You sure are a big help! 