Tobira Grammar complete loading error

So, I’m 100 cards in on the Tobira Grammar Complete course, nearing the end of level 6 of 15.

After 100 cards I can no longer learn new cards, and instead of loading I get an error message saying “Whoops, could not load session, sorry”

That is using chrome. Using my iPhone it simply doesn’t load at all, so it’s not my browser.

Any ideas on how to fix this or contact someone who can?

I’ve ran into the same error. For some reason there are 17 words total according to the header in the Android app, but only 16 are shown. It also seems to work fine in the browser. FAQ suggested contacting the author, @ebodinatsu, and have him check for empty fields, but I have yet to figure out how that works.