Pipeline Tool-- operation could not be completed, parameter is incorrect

I’m getting this error in VS 2019 when I try to open the Pipeline from inside my solution-- I can open it from the file. Anyone else get this error? I’ve tried restarting VS, restarting my computer, deleting the .suo file. It also happens when I run VS as admin. I believe this started when I updated VS a day ago or so.

Thanks!

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