Unfortunately Planmaker has stopped

[kenb8s]

Thisis thefirst time Ihave tried to depend on PlanMaker away from home and have been thwarted by being repeatedly told that PlanMaker "has stopped". I have killed all the apps on my tablet except those needed to update my spreadsheet file. I have a modern tablet running Android 4.1.1 and it has a 2-core processor running at good speed. There is 1GB of RAM installed together with 64GB of SD storage. How can I ensure that PlanMaker stays functional?