Minecraft - SapixCraft Resource Pack Issue

I was struggling to get the resource pack, 'SapixCraft' when I figured it out. I joined a game and it was only green and white, everything made of squares. Not blocks, just huge squares. I tried downloading the resource pack again, and I quit out of my Minecraft. I didn't take off the original 'SapixCraft' and when I tried booting Minecraft, there was a crash report. I kept trying to boot up Minecraft, but I kept on getting crash reports. Please fix this issue as soon as possible.

• Kyle

P.S - I couldn't get an image, sorry. But, I think you get the idea.