Working with a customer to install and setup the SNAPPS templates and came across the same error with two templates: QAnnounce and QProject.
The doWorkflow placebot in QAnnounce and the getAuthors placebot in QProject came back with the error "The page you are trying to edit is already being edited". Tried removing the template and reinstalling and got the same error.
Checked the template dates and they are May 16, freshly downloaded yesterday. Seems to be a repeat issue and wondering if there's a solution.