Are there any errors on the JS Console of your browser, if this error comes up? This could be helpfuf ro Mendix to understand this issue.
Please provide some more info Robert. This is only the end-user message. Probably something occured in a microflow. What are the messages in you Mendix Modeler console?
Or is this on https://sprintr.home.mendix.com? then hit the feedback button at the right!
I have just created my app and was adding some stories until the analyst finished the full list of stories. Its a brand new app. I am not sure if I should delete it and start again?
Did you add stories in the Mendix environment one by one or with an Excel import? If it is with an excel import, did you use the right format? If you used an example of an excel format, are the story ID's empty?
There were no errors, but I have deleted the app and I am starting again. I will keep you informed.