there is no drop down menu while importing Minecraft world

[Alphas Studio 0]

i downloaded mine imator and and start work on it but found an error. i search a lot to fix this error but didn't get any solution. i hope Mine imators will help me out

the problem is that whenever i try to import Minecraft world (by selecting import from world) but there is no option or drop down menu to select world to import. I delete the mine imator and again install it but still have issue. i cant import Minecraft world into mine imator.