If you get Disconnected Error Code 272 on Roblox, Lost Connection due to an error, follow the solutions mentioned in this post to resolve the issue.

Try clearing out all of the external modifications you might have added to the game and reinstalling Roblox, and code 272 should no longer be a problem. Option 3: A Roblox game file might be corrupted ...

Basic Reinstall: Uninstall Roblox through your control panel (or Apps settings) and then download and install a fresh copy from the Roblox website. This is your first line of defense.