I have logged some errors and those occured multiple times:
--Error 1:
Players.<Player>.PlayerScripts.ChatScript.ChatMain.ChatWindow:557: invalid argument #2 to 'format' (string expected, got nil)
--Error 2:
Players.<Player>.PlayerScripts.ChatScript.ChatMain.ChatBar:190: String contains invalid UTF-8
--Error 3:
Players.<Player>.PlayerScripts.ChatScript.ChatMain.ChatWindow:557: invalid argument #2 to 'format' (string expected, got nil)
--Error 4:
Players.<Player>.PlayerScripts.PlayerModule.CameraModule.TransparencyController:168: max must be greater than min
How do I fix them, or are they even fixable? Should I contact Roblox Support or make a devforum thread?

5 comments
what are these errors from any script or model in particular?
They are from the Default Roblox scripts that are loaded in, the Core scripts.
To see those scripts Hit on Play and check the Path
ok
you should contact support