Is there some sort of gasket or o-ring that goes here? (pics)

Im putting my a/c back in my car for summer and I dont know if there is a gasket that goes here. I bolted it on for a few days without the gasket and there was like a oil dripping out of the hoses(I think, it may have came form somewhere else) Whats the cause of that?

Pic 1, A/c line that goes to the condenser that is ran by the belt. Do I need orings/ a gasket that goes in between there?
senior_proj_001.jpg

Pic 2., Oil was dri[ping from where my finger is pointing to.

senior_proj_002.jpg