Hi,
Following the tutorials should normally work as expected, as long as you follow all the steps correctly. Strange errors are usually caused by changing some settings to unexpected values, and unfortunately, it is practically impossible for us to suggest anything meaningful without seeing what exact settings you are changing.
Please try following the tutorial again, taking screenshots of each step. If the problem persists, please attach the screenshots allowing us to reproduce the same steps on our side, and we will try to suggest what could be causing it.