Checking non-numbered parts... Checking duplicated references... ERROR: Duplicated reference R1. Checking NoConnection nets for connections... Checking nets with only one connection... ERROR: Net 'GND' is connected to only one pin: R1:1 . ERROR: Net 'unnamed_net1' is connected to only one pin: R1:2 . Checking pins without the 'pintype' attribute... Checking type of pins connected to a net... Checking unconnected pins... Checking slots... Checking duplicated slots... ERROR: duplicated slot 1 of uref R1 Checking unused slots... No warnings found. Found 4 errors.