forge servers problem

Hello. i have problems with my forge server and it says connection closed - [Obfuscate] received unknown synced data key.

https://mclo.gs/AmJwFS5 heres the server log and i also attached my client log

okay im trying out it right now hope it works brb.

im sorry but i checked and it seems that the versions are the same and i still cant join it

i did remove it it still shows the same thing#

i also reinstalled the generators cuz it didnt fix so here they are

https://mclo.gs/66tFtlG

also i dont think i did anything else

it fixed but my friend cant join so heres her log and the server log.

server:https://mclo.gs/cN8y28e

hers:

hi Roman. i have fixed the problem but have one more question. i downloaded simple voice chat and mekanism but i got a walkie talkie and it says voice server disabled and when i use the simple voice chat i get a message and it says: voice chat unaviable. so both of the mods dont work and i dont know what a voice server is

wait.. do i need to change to port in the server and client? didt really understand

so i changed it on the server nothing happened and also do i need to restart the world for this?