error with opening help.doc

I recently installed Matlab 2015a.When i try to open help following error comes out.how can i solve it?

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: Could not initialize class com.mathworks.mlwidgets.

Answer 1

[Thomas Koelen]

javaclasspath

ctrl+f in command window -> searchf for mlwidgets, it should be there. If not, I guess you have two possibilites: either re-install MATLAB or add them to the static class path as described in

doc javaclasspath

whereas the latter is of course more for testing, while this solves the problem.