ant:while deploying it says:tomcat/lib does not exist

hi all.my tomcat directory is: d/tomcat7, my build.properties file:

appserver.home=D:\apache-tomcat-7.0.27
appserver.lib=${appserver.home}/lib

deploy.path=${appserver.home}/webapps

tomcat.manager.url=http://localhost:8080/manager
tomcat.manager.username=tomcat
tomcat.manager.password=s3cret
##############endofbuild.properites

it fails in this row of the build.xml:
<taskdef name="install" classname="org.apache.catalina.ant.InstallTask">
<classpath refid="catalina-ant-classpath"/>

the exact error mesage is:
D:\SpringWorkspace\Inventory\apache-tomcat-7.0.27\lib does not exist.

here inventory is my project base in eclipse.i could not understand why it looks into project directory.do you have any ideas?

Best Regards.

You need to provide more information. The portion of the build.xml you posted does not contain all of the information about the error. Please post the full build.xml and the full output from running ant. I suspect that your catalina-ant-classpath setting is incorrect.