While I'm running a simple application in my Netbeans 6.9.1,it's showing "task running, click for details" for a long time .and also there is an error "unexpected exception" in the bottom of the netbeans when I'm clicking that:
NoSuchMethodError: org.apache.tools.ant.util.FileUtils.getFileUtils()Lorg/apache/tools/ant/util/FileUtils;
This error is coming. Few days before this application executed well, but now this error for all applications.The main error is it's not running,but it's showing "running" for a long time..
You should move to the newer or at least stable version of netbeans (from what I can see you are using a beta version '6.9beta'. Download the latest stable release of netbeans and open your project there.
来源：https://stackoverflow.com/questions/7387477/running-application-in-netbeans-results-in-nosuchmethoderror