Why cant I go back!?!?

Today I tried to warp back to my dimension. The warp portal appeared but when I tried to go in it spat me back out! What is going on!?! That's only supposed to happen if a human tries to get in! I need to get to the bottom of this. There is only one person to go to. Sr. Zorro! I met with him at a library and 

we had a talk.        As it turns out once in Earth there is only one way to warp. Using Earths own technology! The problem was Earth didn't have that technology!