There's water leaking from this copper pipe (line?) in my HVAC unit. What could be the cause of(00)

There's water leaking from this copper pipe (line?) in my HVAC unit. What could be the cause of(00)

Image gallery: Hvac Pipe Leaking Water

There's water leaking from this copper pipe (line?) in my HVAC unit. What could be the cause of Humid Leaking Pipe of a Central Air Conditioning System and Cold Water Drops on it Stock Photo Why is my AIR CONDITIONER leaking water from the pipe outside Common Causes - YouTube