Mimeo Photo Book - An error occurred while loading the project extension “Mimeo Photos”

I successfully created some projects in Mimeo and Photos earlier in the year which I printed. However, Mimeo has now updated and every time I try to go into the project it states that "An error occurred while loading the project extension “Mimeo Photos”" - I have deleted the App several times and reloaded it and rebooted too but I still get the same message. Can anyone advise what to do.