Unable to open Learn>Vocabulary due to 'invalid input parameters'

Has anyone experienced the same thing? I’m trying to access the Learn>Vocabulary section of the site, and all I’m being told is that the page can’t be loaded. When I return to the Lingq home screen, I’m met with a list of notifications telling me that there are invalid input parameters.

I think it started when I tried to deselect two of the numbers (I’m not sure what they’re called, but it’s the numbers 1-4 based on how well you know the vocab) without the page reloading in between.

Here’s the homepage that I’m faced with:

Sorry for the trouble here!

Would you return to the Vocabulary page, copy the URL in the address bar then paste it in here? This should give us a better idea of why this might be happening…