The problem is that one of your components uses pin type unspecified. This pin type always throws a warning in the default ERC setup. (No matter what you connect it to)
The green arrow simply points to one of the places where there is a problem.
The problem is the SEWTAB-ALIGATOR symbol. Change its pintype to passive and this problem should go away.
Use crtl+e on top of one of these placed symbols. Change the pin type via the pin settings dialog to passive. Save the lib and re run ERC.
You will then only be left with this one: ErrType(3): Pin connected to some others pins but no pin to drive it
The pin number P$1 is ok.