Cant connect?

[Lunarrr]

So im hosting a server on minecraft-hosting.pro launched the server using their Feed the beast revelation release or whatever but when i try connecting to the server this appears. cant figure out how to fix this, anyone got a soulution?

 

[Lunarrr]

https://imgur.com/Z4tEd4n

 

[mc.crab]

Check that you have the correct version on the pack. The error shows that you have different versions of the mods on your client than on the server.