Creating a game on Roblox, while far easier than making one from scratch, is not a cakewalk, given the number of possible errors users might encounter on their design ...

The error usually occurs when your PC tries to communicate with the game server, but the request becomes invalid or incorrect. Essentially, this is a client error ...

If this is the case, restart your computer or laptop first, followed by your internet device (modem/router) for good measure. Also, check status.roblox.com to see if any server maintenance is going on ...