Won't Start

[c411um2003]

I click the start file and i see a black box appear for a millisecond then it disappears and nothing happens. In a tutorial I watched it says files should appear in world anvil file however nothing changes. I have put in a zip file containing these files and my world so please contact me.
LevelDb2Anvil-master.zip

[haeter525]

A more stable Converter.jar had been uploaded, it should work well for you :)