Ok, I, as many others too (just google "tekkit lite multiverse" and you will find a lot of others) have problems getting Multiverse to work with Tekkit Lite.
I'm using BukkitForge and can load several plugins successfully using it, and I can see all the Multiverse commands when I type help.
But I can't import any of my maps from my private Tekkit Classic server! I have converted it using the method in this thread, but I can't import it to Multiverse using the mvimport command.
The minecraft server tells me "FAILED." and "That world folder does not exist. These look like worlds to m