I am hosting a world and every time my friend tries to join it stops on "syncing mods"

I am hosting a world to my friend and every time he tries to join the world it just says "syncing mods'' then after about a minute it says "connection lost". We have been trying to play together for days now and have read through every forum imaginable trying to find a fix. We really need help. I have attached my (the hosts) logs.
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