Fatal error: Class WPSEO_Snippet_Preview not found

I’m having the same issue.

I disabled it the plugin, but now we’re missing the SEO stuff.
I went back to a previous version of our theme, just to rule it out, but it didn’t work.
I also disabled W3 Total Cache, but that wasn’t the solution.

I have the same problem too!

I fixed the problem. I activated Jetpack plugin, the Yoast snippet preview came back. I don’t understand how these two plugin related though.

After reading this I installed the Jetpack plugin. At least this is a workaround.