“Invalid order of phases: an object cannot be demolished before it was created” while loading model group into Revit project

Solution:

To avoid the warning message check the following steps:
1. Open the group separately in Revit.
2. Check the phase assignment to the elements, search for elements that have the same phase selected for the fields Phase Created and Phase Demolished.
3. If the mentioned elements will be found, change the phase assignment to have only one stage for one phase. 
4. Save the changes in the group.
5. Load the group into the project.