Shep Sheplan

My brother and I are attempting to use GTXgaming as a server host and although we got it to run once with mods, it crashed. He ran it last night and is saying - "The assets used set off exploding all at once then I guess Helios took off somehow with no pilots so stuff it normally shouldn’t" Seeing that there are some lines of warning that some things don't exist. Is this something to do with whether we have it on the server side or client side? Any help is appreciated, Thank you for your time