I'm running into an error with CreateMobileMapPackage:
ERROR 999999: Error executing function.
Item with the same path name already exists.
Failed to execute (CreateMobileMapPackage).
I'm targeting an empty folder, so it's not the obvious "check to see if the mmpk already exists" issue. I also created a different map package with different layers referencing the same feature class, so that's not the issue either. Before I tap tech support's shoulder, I thought I'd see if anyone else had encountered this error and figured out what's going on.
Update: I created a package with two layers having the same name, so that's also not an issue.