Error: Could not find or load main class org.netbeans.modules.web.project.ant.JspCSingle

Error: Could not find or load main class
org.netbeans.modules.web.project.ant.JspCSingle

Error: Could not find or load main class
org.netbeans.modules.web.project.ant.JspCSingle
C:\Users\Umesh\Documents\NetBeansProjects\LonavalaProperty\nbproject\build-impl.xml:610:
Java returned: 1 BUILD FAILED (total time: 0 seconds)