First things first: make sure you’re running the latest version of the Roblox Player. Outdated versions are notorious for causing conflicts. Check the official Roblox website or your platform ...

Fix #1: Use a non-child account. The most common reason why many people are unable to join a game and encounter the Roblox error code 103 is an issue with their account.

What is ‘Error Code 1001’? Roblox is one of the most popular game-creation platforms with an estimated 214 million monthly active users.