Error messages: Unknown error

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Sometimes, you will encounter an "Unknown error". The complete error message is "Tests didn't pass: Unknown error". However, this error message is usually misleading. But most important of all: the error isn't affiliated with your code. Instead, the test framework doesn't actually run.

However, you will also encounter the error on empty tests. Some katas don't provide example test cases. Run won't work in those circumstances, since there are no tests to run. Instead, press Submit on those katas.

Another workaround that works sometimes is submit -> reload -> submit. However, this doesn't work all the time.