ant taskdef class org.apache.catalina.ant.installtask cannot be found

While using Apache Ant with Apache Tomcat  with if this error appears

ant taskdef class org.apache.catalina.ant.installtask cannot be found

Solution:
If you are using tomcat version 7 then add this to your build.xml file.

<taskdef name="install" classname="org.apache.catalina.ant.DeployTask">

instead of 

<taskdef name="install" classname="org.apache.catalina.ant.InstallTask">