robertferanec , 07-04-2019, 02:38 AM
You will need to go into schematic symbol library and PCB footprint library of this specific component and double check pin names / pin designators. When this errors appears, usually they are not the same. Pin designators have to be same between symbol and footprint, so altium knows what pin in symbol is what pin in footprint.
PS: Simply to say, go into your diode footprint and be sure the pins designators are 1 and 2.