See my other reply.

In short, when this error occurs, this means that the tests expected to receive an equation string from equal_to_24, but instead got "It's not possible!", and the SyntaxError is raised as a result of calling eval.

This is a known issue with the code runner which is not specific for this kata. I will mark your report as resolved, and there already are corresponding tickets on CW's Github.

There seems to be an issue with the test: I was working on my algorithm, trying out a modification and suddenly I had "passed" the tests - only that there were only 2 of them that had run, and very basic ones... Not sure what causes this on the back end, though. The only thing that I could think of is an "exit()" statement in my code, that I was using for debuggin.

In Python, it seems I had the same problem as some others as well: In the random tests, my result was sometimes off by 0.01. This happened a few times, every time on only one of the tests. I was able to pass by attempting a bunch of times though...

I also found this comment by the author below. However, I don't understand how these 2 examples are considered the same. It surely can't be because the result is the same ...

This checks the automated test, but not a human.