1 Checking non-numbered parts...
3 Checking duplicated references...
4 ERROR: Duplicated reference U1.
6 Checking NoConnection nets for connections...
8 Checking nets with only one connection...
10 Checking pins without the 'pintype' attribute...
12 Checking type of pins connected to a net...
14 Checking unconnected pins...
18 Checking duplicated slots...
19 ERROR: duplicated slot 1 of uref U1
21 Checking unused slots...