I have a hierarchical schematic, structure as follows
I want to automatically assign reference designators to U?, C?, etc REFDES properties.
I click Tools -> PCB Interface -> Assign Reference Designators.
I get the error
Could not open schematic Interfaces
Note that "Interfaces" is the name of my root level schematic. If I look at the Interfaces.err file it says
viewbase: Error 222: Error - Could not find WIR file INTERFACES.1.
I get a similar error if I choose instead Create Netlist for Layout. The CFG file is the standard Pads94.cfg
I see no errors when running Tools -> DxDesignerDiagnostics
What does this mean? How do I fix it?