taskdef class org.netbeans.modules.java.j2seproject.copylibstask.CopyLibs cannot be found

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I got this problem while building JAR.
I have spent 10 to 15 to solve this headech steps wre:
Right click over the Project and select option -> Resolve Reference Problem....
Then It will display which reference is really problem just locate the right Libraries.
And tan tada done :)....


Best of Luck...

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