Here is my structure - 

I'm using Jenkins Ant plugin to generate a html report via a build.xml file 

On my pc I have downloaded the Ant Apache and is added to the Environment Variables

On Jenkins Manage Global Tools I have added Ant and the path of the file

Everything is working except if the build is failed it wont generate report, however it will generate the failed report if the next build is successful or fixed. it look like as if the failed report gets stucked until the next one is a pass it will come through.