The libs.CopyLibs.classpath property is not set up. This property must point to

libs.CopyLibs.classpath=C\:/Program Files/NetBeans 8.0/java/ant/extra/org-netbeans-modules-java-j2seproject-copylibstask.jar

set this in yor netbeans  go to netbeans tools>options>

java tab
and add properties

libs.CopyLibs.classpath=C\:/Program Files/NetBeans 8.0/java/ant/extra/org-netbeans-modules-java-j2seproject-copylibstask.jar 

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