The PDE-PLI018 error refers to the name of the PLL, not the report. Perhaps they have named the PLL with the same name as the RDF.
First, you need to get the PLL file from whoever gave you the RDF.
Then, put it in a folder somewhere, and point to that folder in your REPORTS_PATH (where this is varies depending on your OS, e.g. in Windows it's in the registry).