Ok, first, there was some talk about stealing work...
Guys, if the servers were professional, they would get ASM experts, who would make an anti-leech, like Rusaki, which is totally awesome btw, and if they don't have it, that means you can just take it, they don't care about it, because they don't secure it... And ignore those "Copyright warnings" on the server's websites, they can't copyright ****, because P-Servers are illegal at first...
Like, I'm working on Dekaron quite a while now, and the deving most people do is just client/server modding or reversing to lower actions. I myself am trying to make anti-leech and anti-hack systems by ASM, although that's a pain in the... Well, you get the pioint
Secondly, I think what you're experiencing is some kind of an anti-leech system, but a really bad one, it's working like this: They use good server files, but for something fully server-sided, they mess up that file, so that if you put it on the server side, it won't connect or won't start up... It's a simple but somewhat effective anti-leech system. So you'd first need to find our which file is the bad one, which would take time (note that there may be a few of em), and then replace them with working ones.
That should fix your error in theory, if you don't run into another problem.