I bought a new computer recently and while i was on my old one I accidently clicked on re-create world on an old file that wasn't in use. Now everytime I use minecraft I cant access ANY of my worlds as it sends me a crash report everytime I attempt to get into a world.I've attached the report as well. Can you please help me fix this

What I expected to happen was...:
For the game to open as per normal, but on a new computer

What actually happened was...:
Accidently clicked re-create world on another saved file (that wasn't needed) and now now of my worlds work as crash report comes up every time.

Steps to Reproduce:
1. log in and open minecraft
2. open singleplayer
3. click on world
4. crash report