Chrome error messages blocking everything

Hi I am completely unable to perform any action on my site because every time I click on a menu bar it takes me to the ‘Aw Snap’ page of Chrome.

I have disabled all my extensions on Chrome and I can’t change my theme because I get the same message when I click on that option too.

I am working from a Chromebook. Does anyone have any experience of using wordpress from one? I was assured it would work just fine.

Thanks.