My friends cant enter the server but i can.

hi, my friends cant enter my modded server and it says "Failed to synchronize registry data from server, closing connection". can someone tell me the prob and is there a way to fix this? thank you in advance.

Quote from Joshy | #galaxymax

Did you add mods to the server recently?

yes but my friends has it too

one of my 3 friends manage to get in but we still dont know the reason since we have same mods and same versions of it.

Quote from Joshy | #galaxymax

Did you do what I said?

yes