How to fix PMD violations with WalkMod

I am trying to run the walkmod pmd plugin but getting “The chain pmd is not found”.

Below is the walkmod.xml:

<!DOCTYPE walkmod PUBLIC “-//WALKMOD//DTD” “">
 <transformation type=”imports-cleaner”/>
 <transformation type=”pmd”/>

I am using the below command for apply pmd:

walkmod apply -DconfigurationFile=ruleset.xml pmd
Can you please help me if i am missing something.
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