MidiYodi is developed in Java which requrie Java Runtime Environment (JRE) to be installed on your computer as well. JRE’s are installed with earlier Mac versions and Unix OS’es and often it has also been installed on Windows due to other Java applications that has already been downloaded.
MidiYodi require JRE 1.8 (also known as Java 8)
If in doubt, check in the System Preferences on Mac or check by issuing the following command in a command prompt or shell window.
It shall respond with:
Java(TM) Runtime Environment (build 1.8.x....)
Where 1.8 is the latest major version of Java.
If Java Runtime Environment is not installed you can easily download it for free from here:
Download Java (Follow the instrucions to download and install JRE 8.)