ZipDevXP

When I attempt to import my custom map with Multiverse, it always crashes my server. The way I upload the world is by uploading a zip file of the world to my file manager, then I unzip the file and delete the previously zipped file while keeping the actual world folder. Now usually this works and Multiverse can identify the file as a world file, but whenever I attempt to use the command "/mvimport (world name) normal" the server crashes after stating "An internal server connection error occured. You were kicked from (server name): An internal server connection error occured." If anyone could help me I would greatly appreciate it. I tried to be as specific as possible but if you need further elaboration I will gladly do so.