Randomly unable to run or debug android gradle project due to menu items/buttons greyed out

[Robert Tuck]

This has started happening recently about > 50% of the time when I open netbeans.

I am unable to run or debug my main Android project due to the Run and Debug menu options being greyed out.

Attached are netbeans log files with verbose settings. There are exceptions in it which may possibly be related:

INFO [org.netbeans.gradle.project.model.SerializedNbGradleModels]: There was a problem when deserializing model for org.nbandroid.netbeans.gradle.AndroidGradleExtension java.lang.ClassNotFoundException: com.android.builder.model.AndroidProject at java.net.URLClassLoader$1.run(URLClassLoader.java:372) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:222)

I recently upgraded NBAndroid and added an additional gradle library sub project (there was already one existing and I duplicated it). I don't know if this is related.

[Robert Tuck]

I should add that changing selection in the project tree, editing project config, closing and reopening the project all appear to have no effect.

So far the only way I have discovered to enable the menu items is to close and re-open netbeans until they re-appear.