I just started to learn Blender and was following a tutorial on YouTube on making ice-cream. I was almost done with the cream but when I added subdivision modifier my model started having gaps. Please give me some suggestions how to solve it. I am pretty sure I followed the tutorial. Here is the link to the tutorial on Youtube:
https://www.youtube.com/watch?v=EvTrZ0soo_Q&list=PLrjIgEdKLivgpCMmFC0_sV60Y_Ftp-WLD&index=2
Please tell me if you want more screen shots.