Specified VM install not found: type Standard VM, name jre6

Ant wont run says "Specified VM install not found: type Standard VM, name jre6"!
Solution : delete the "C:\Users\Mujahed\workspace_helios\.metadata\.plugins\org.eclipse.debug.core\.launches\projectname build.xml.launch file"
and problem is solved"

maven eclipse error - Eclipse is running in a JRE, but a JDK is required

-startup
plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.1.R36x_v20100810
-product
org.eclipse.epp.package.jee.product
--launcher.defaultAction
openFile
--launcher.XXMaxPermSize
256M
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
-vm
C:\Work\Sun\SDK\jdk\jre\bin\client\jvm.dll
--launcher.defaultAction
openFile
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms128m
-Xmx1200m
-Dsun.lang.ClassLoader.allowArraySyntax=true