Ok: post under the Java translator comment, so that he can be notified :)

Java.
Input data is from "Your test cases" field: {0,1},10; {1,1},10; {0,0,0,0,1},10; {1,0,0,0,0,0,1},10.

I press "Submit" and get it:

basicTests(XbonacciTest)
10
randomTests(XbonacciTest)
...
Test Passed

1 Passed
1 Failed
0 Errors

Which language and which input (you can always print it)?

The same problem, basicTests failed with errorcode "10". In IntellijIDEA my solution works good.
What does it mean?

I assume that you meant when you run the sample tests; well, when you press "submit" you do many more harder and also random test cases.

My guess is that your code does not work when the tests require a sequence shorter than the signature.

I don't understand.
When I run tests, they passed. But when I want to submit, it tells me that basicTests failed.
Can someone help me ?