Roblox error code 529 indicates an HTTP error. This usually means that the Roblox server is experiencing difficulties, or is just being maintained offline. The text reads: “We are experiencing technical difficulties. Please try again later.”
As it, when this happens, there is really nothing you can do except check Roblox’s Twitter feed to make sure there is something wrong with the game. If this is the case, or the server is down for maintenance, you will need to wait until Roblox ends to resolve the issue.
If the server is not under maintenance when you receive Roblox error code 529, please first try to press the “Retry” button at the bottom of the error code window.
If this doesn’t work, try exiting the game and reloading. It may be that your connection to the server was interrupted, so you need to restart the game to reconnect. If restarting the game does not work, you can also try to restart the Internet router or try to play Roblox on different platforms on other devices.
If all other methods fail, you can just wait and try again in a few hours. For ongoing issues, please ask Roblox on the official support page.