Hello I want to install Flan's Mod (with the content packs) on my 1.12.2 server. I've been trying for quite a while but nothing, the server doesn't start. Please send a video link or explain to me how ...

i wanted to download flans mod for 1.12.2, but wen it gets to phase 2 it crashes. at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at ...