Thanks
Go here Game Manager setup and set the version to Forge Recommended (v10 Stable) as pictured here:
Then, Stop
your world here
Then, on The Forge, scroll to the bottom and make sure your game is using the Default Game Manager version of Foundry
Then, go to the Bazaar and Update your modules to v10 versions.
Then, after the updates are done, try to launch your world again.