Renshuu.org - Study Japanese Online

Created a vocab list of 154 terms for personal use.
A few did not exist in the site's DB, so I used the option to add them manually.
Using ALL study vectors.

Whenever I try using it, I get an error message "Sorry, but you have chosen an invalid quiz method. Please try again!" (before that it says the admin has been notified, but I figured a more detailed explanation might help).

Is this perhaps caused by the terms that I added myself?
Could it be due to large number (Not sure how to split list into lessons, if possible at all).

EDIT:
It either fixed itself (or was fixed ), or the problem may been something even more odd. It suddenly started working after the daily reset (at 0.00 in my case).

I saw the errors getting logged, I just did not have a chance to check it out - even if it appears fixed, I still plan on looking at it this evening! I will let you know what I find.