Unable to connect to a modded server

HI yall, i have set up s server that is heavily modded (70ish mods 10+ large content mods 20+ mods for running other mods 40+ small mods with limited features) using 3gb of ram and after alot of messing around i have finnaly installed all needed mods on both server side and client side and server booted without any error messages but when i joined i got this message. From my research this is a modpack compatiblity issue but since there is so many and alot require other mods to run taking them out individually would be very tedious and time consuming. Thanks Error message in text form: internal exeption: io.netty.handler.codec.decoderException:java.lang.indexOutOfBoundsException: readerIndex(3) + length(1) exceeds WriterIndex(3): PooledUnsafeDirectByteBuf(ridx: 3, widx: 3, cap: 3)