This message was caused by adding, removing, or changing render elements during rendering. Corona will not save render elements at the end of the current rendering session to prevent instability and possible errors/crashes.
Render elements count has been changed during rendering
- Individual render elements have been changed, while maintaining the total number of them
Never add, remove, or change render elements and their parameters during rendering
- If you do change render elements during rendering, Corona will not save render element files to prevent instability. You can still manually save render elements from Corona VFB, so they are not inevitably lost
See: Render Elements
Video: Saving all render elements at once , CESSENTIAL elements