java.lang.NullPointerException: null at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:32

java.lang.NullPointerException: null at sun.misc.Launcher A p p C l a s s L o a d e r . l o a d C l a s s ( L a u n c h e r . j a v a : 325 )   [ n a : 1.8. 0 1 72 ] a t j a v a . l a n g . C l a s s

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