Mandatory input missing issue in keras model

Hello @asf - there is a dedicated thread for the Keras extension.  I would recommend reposting there.

http://community.rapidminer.com/t5/RapidMiner-Studio-Knowledge-Base/Keras-Deep-Learning-extension/ta-p/40839

Scott

I had a similar issue (NullPointer Exception), which I was able to clear up by having only one Java Runtime on my system (I had two) and making sure the JAVA_HOME environment variable was correctly set (i.e. it pointed to the JRE for the Java Runtime I kept). 

In Windows you do this through the Windows Control Panel.  Open the System Applet  --> Advanced system Settings  --> Environment Variables.

If you update your Java runtime, update your JAVA_HOME environment to point to your updated JRE.

Hope this works for you.