I'm a Canvas admin at my school, and we saw this error today. One group of students took a quiz using New Quizzes and Respondus LDB early in the day with no issues. A second set of students tried to take the same exact quiz later in the day, and everyone got the error robot. I added myself to the course as a student to test it myself, and I got the error robot also.
We tried the following: updating LDB, starting from Canvas, starting from LDB, duplicating the quiz. We got the error robot every time. I also double-checked the settings, and it everything was set up correctly.
The only way we could get rid of the error robot was to remove LDB from the quiz. After it was removed, everyone was able to take the quiz with no problems.
So, this appears to be a Respondus issue, but I'm not seeing any mention of the error robot in Respondus. This post is the only thing I could find.
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.