Build.XML is not running correctly after compiling ant

Looks like having an error


<taskdef name="testng" classpath="${test.classpath}"
classname="org.testng.TestNGAntTask" />


Getting Error in Black Screen:

BUILD FAILED
C:\Freedom\Module9\build.xml:39: taskdef class org.testng.TestNGAntTask cannot b
e found
using the classloader AntClassLoader[C:\Program Files\Java\jre1.8.0_66\lib\char
sets.jar;C:\Program Files\Java\jre1.8.0_66\lib\deploy.jar;C:\Program Files\Java\
jre1.8.0_66\lib\javaws.jar;C:\Program Files\Java\jre1.8.0_66\lib\jce.jar;C:\Prog
ram Files\Java\jre1.8.0_66\lib\jfr.jar;C:\Program Files\Java\jre1.8.0_66\lib\jfx
swt.jar;C:\Program Files\Java\jre1.8.0_66\lib\jsse.jar;C:\Program Files\Java\jre
1.8.0_66\lib\management-agent.jar;C:\Program Files\Java\jre1.8.0_66\lib\plugin.j
ar;C:\Program Files\Java\jre1.8.0_66\lib\resources.jar;C:\Program Files\Java\jre
1.8.0_66\lib\rt.jar;C:\Program Files\Java\jre1.8.0_66\lib\tools.jar]