Terraria not starting. Can I get Some help?

When I launch Terraria via Steam, it does the "Preparing to launch Terraria" message, then says it's running for half a second in Steam, and right before shutting down, it says "Syncing"

I don't get any error message from this, and it's not even running in the background, and I've tried restarting my computer. Can I get any help?