Which SAS environment are you using? Foundation (sometimes called Base SAS or Display Manager), Enterprise Guide, SAS Studio with a local install, SAS On Demand for Academics or something else?
One of the occasional causes of Java errors is an "update" to Java that replaces or removes the SAS supplied Java which does not have the proper links for some of the elements SAS uses. When environment will let us know how to check on which JVM SAS expects to see and which you have.
PS: And it may help to provide the code or settings used with Proc Power.