[Konstantinos]

Well, there are hundreds of threads about this run time error and you could've found how to fix it in only few minutes by searching. Once again, load nativechecker plugin and add it last in the plugins line in server.cfg
Run the server and it will say what functions are not registered. The name of those are pretty easy to find out from which plugin they come from so you can load that plugin, but in case you're not aware of, then post the server log.