Common cases of ad reporting an error as unknown pin

Altium Designer   Common unknownpin errors in PCB Design:

The package was not found, the package name was not filled in the schematic diagram, and the pin number was not filled in, resulting in the network was not imported, the pin number was mismatched, and the pin number was missing


  I use the footpin not found here because the imported encapsulation is wrong. Another is that its pin number is reversed.

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