I've followed the steps to add a custom modpack,but having issues.

[sharp junco]

it starts fine but when I join it says Connection Lost : Invalid payload register, originally the server wouldn't start and kept crashing giving an error about no server.jar file

[sharp junco]

I figured it could be an issue of using paper instead of fabric, i switched it - deleted previous filed and reinstalled my mods, now i'm getting a new crash message and it wont start at all

this is the full log from starting

[twin fractal]

hey there, looking at the log I see you installed a voice chat mod. These voice chat mods require some setup in the config regarding networking (IP and port need to be set). It seems like you didn't do this, so it fails to correctly attach to the network, which in turn causes a crash

What you need to is go to the "network" tab on the panel, then pick one of the rows of available ports there. Note down the IP and port. Then go to the config file of the voice chat mod, and on the line for IP enter the IP you noted down, and for port enter the port you noted down

[sharp junco]

so it'd be this section here: 199.115.73.129:1045?

[twin fractal]

You need to pick one from the list below. The top line is the minecraft server itself, which is already in use

pick one of the other ones that is not in use already

[sharp junco]

and then i'd go into the config, voicechat, and open up the

server properties?

[twin fractal]

no not server properties. the config file for whatever voice chat mod you're using

server properties is like a config file as well, but that's for minecraft itself. In this case you need the config file for the voice chat mod

[sharp junco]

this or?

[twin fractal]

yes

[sharp junco]

yeah it's under server properties for it, sorry for the confusion

[twin fractal]

voicechat-server.properties, that indeed is a bit different

each mod names the files differently

[sharp junco]

The server's no longer crashing, I'll check if I can log onto it fine and let you know!!

[twin fractal]

Great! Hope that was all

[sharp junco]

I'm receiving this error now not sure if this is a server sided one or a modpack one

i can send the report file itself

[twin fractal]

It seems like the server is sending data to the client that it cannot understand. This often means there's some kind of mismatch between the client and the server

[sharp junco]

It launched fine the 3rd time I clicked to join it, I think that's it sorted now! :)

Thank you for the help, I really appreciate it