Issues when link between REVIT and ROBOT

[Anonymous]

Hi! I am trying to link my model in REVIT to ROBOT for structural calculation but I encountered these kind of errors. 

When I clicked on one of those warnings, it shows a point that just in the middle of the floor. What does it means? How can I fix these?

Thank in advanced.

[Romanich]

Xin chào @Anonymous ,

Please check this video :

https://www.youtube.com/watch?v=5CCLzG12JQ4&list=PLY-ggSrSwbZqow_60fiqJwS69mg1nQMzk&index=16&t=2s