本人初学ant，哪位好心的大侠能指点一下的，下面是出错问题，org.apache.ivy的包也已经加入ant的运行环境中了，谢谢
Buildfile: E:\workspace2\PMI\build.xmlBUILD FAILED
E:\workspace2\PMI\build.xml:77: Problem: failed to create task or type antlib:org.apache.ivy.ant:settings
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.
No types or tasks have been defined in this namespace yetThis appears to be an antlib declaration.
Action: Check that the implementing library exists in one of:
-E:\eclipse\plugins\org.apache.ant_1.7.1.v20090120-1145\lib
-C:\Documents and Settings\Administrator\.ant\lib
-a directory added on the command line with the -lib argument
Buildfile: E:\workspace2\PMI\build.xmlBUILD FAILED
E:\workspace2\PMI\build.xml:77: Problem: failed to create task or type antlib:org.apache.ivy.ant:settings
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.
No types or tasks have been defined in this namespace yetThis appears to be an antlib declaration.
Action: Check that the implementing library exists in one of:
-E:\eclipse\plugins\org.apache.ant_1.7.1.v20090120-1145\lib
-C:\Documents and Settings\Administrator\.ant\lib
-a directory added on the command line with the -lib argument
The name is undefined.仔细检查一下你各个节点的名字。