Jep that is a common error message, could be because of closing and opening a page in the same microflow or transaction in that order.
There a bit more forum posts about this:
https://forum.mendix.com/link/questions/90417
https://forum.mendix.com/link/questions/95328
https://forum.mendix.com/link/questions/92881
https://forum.mendix.com/link/questions/93769