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A java.lang.NullPointerException exception has occurred
Could you please attach your messages.log file? (It can be found in NetBeans userdir under var/log/)
Created attachment 23552 [details] Netbeans Error Log
Created attachment 23553 [details] Screen Shot of Error message
Looks like a platform issue.
Seems to be caused by issue: #46813. The NPE is fixed by Jesse's commit: org.netbeans.spi.project.support.ant.PropertyUtils rev 1.29 *** This issue has been marked as a duplicate of 46813 ***
Note: the actual NPE is fixed by my commit for NB 5.0, but other things may still be broken. My commit just produced a more useful message for it.