在netbeans7.2中运行任何程序后我遇到了这个问题
我的java路径如下
C:\Program Files\Java\jdk1.6.0_23\bin
我的netbeans安装在C:\Program Files\NetBeans 7.2 Beta
执行此行时发生以下错误：
jar:file:/C:/Program%20Files/NetBeans%207.2%20Beta/java/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml:37: Problem: failed to create task or type componentdef
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.