Catia Users

Created by Ananth Narayan on 8 March, 2018

How can i merge the black points on Catia ?

Hello everyone. I am trying to make an UAV on Catia by using Generative Shape Design and I will make its analysis on ansys. And I tried to many times make its analysis but It gives me some errors and it makes me think about a problem to my sketch. Here is problem :
When i try to merge a surface with a different surface , the black points appear where they connect. here you can see the photos . If you help me I will be so happy