Error: to many outputs to the same url ?

I am trying to use the latest fcpx/compressor combination after my final cut studio2 rig imploded. Having an old machine around is not an option for me right now so I am struggling big time with the “new paradigm” on a 2017 iMac. I still do dance recitals and weddings. Yep, that means DVDs. Lots of them. I’m trying to create .m2v and dolby ac3 files. I keep getting the above message when I submit a batch. Im still unfamiliar with the interface but it looks like I’ve got a batch that has a dozen or two source files, one for each type of file that can be produced. I the get the above error message when I submit the batch. I can’t seem to delete them because when I quit and come back they reappear! This is driving me nuts. What am I missing?