Software check of the schematic: unconnected pins, conflicting drivers, missing GND.
How it looks
Drawing: ERC looks at the schematic, so there is no board picture for it
A small schematic in the style of CORE3588's power switch. ERC reads only the drawing, not the board: it has found an input pin left floating and a supply with nothing driving it.
How it works
Where it fits
ERC checks the schematic; its partner DRC checks the board layout. Both are gates before a board is ordered.