Phone 2d no Start

It's my first time making a phone game so I pickes the mobile 2d option, but when unity starts it's opening/loading process it gets halted by this error. No way to get past atm.

 

So, what happens when you choose one of the options presented?

 

An infinite loop. 'Revert' asks if I'm ok with the defauts, I hit continue but then it goes back to the pic I've posted. 'Defaults' just loops the dialogue box up everytime.