i am trying to use the teaspoon plugin on my server but the server crashes every time. The crash dump says that teaspoon is the plugin causing the error. The error messages is alias "ender" already existes
Teaspoon is notorious for being horribly made. The fact that it caused the problem doesn't suprise me. You'd have to contact its developer, though personally I'd just advise removing it.
If you want to use it, go into the plugin_data folder for TeaSpoon and set the "dimensions" thing to false.