i cant load up minecraft and it keeps saying i cant load it

Put the summary of the bug you're having here

*What I expected to happen was it was going to load:
Describe what you thought should happen here

*What actually happened was it said there was a error on the loading and it is just not loading!

Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...