Sheet froze and won't open now

edited 12/09/19 in Smartsheet Basics

I was working in a very important sheet and it froze.  It is still listed under sheets on my home screen, but I get an error message every time I open it.  It's an errorCode: 6.  Anyone else run into this? I have logged out and logged back in, but this one sheet won't open in any browser and I need to access it asap.