I read on stackoverflow that if you delete NAMESPACE, devtools::load_all(), then devtools::document() that the problem would be fixed. I did not have any success with this.
I was hoping I could get some guidance on this error.
Okay, so I just figured it out. When I changed the name of item.rda to items.rda I just used mv item.rda items.rda, but there was some additional object renaming work that needed to be done.