my world wont show up on minecraft, when it can be found in my saves bin

Put the summary of the bug you're having here
my world wont show up on minecraft, when it can be found in my saves bin
What I expected to happen was...:
Describe what you thought should happen here
i expected tosee my world in minecraft to play it
What actually happened was...:
Describe what happened here
the world didnt show up when it was was in the saves bin
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...i dont know
3. ...