AutomationView: Validate All Addresses reports unbound variables, addresses outside the equipment range, or duplicate addresses. Almost always: the variable / equipment link is incomplete or stale.
Variable 'X' is not linked to any equipment channel.Address %I0.3 is not declared for the selected equipment.Address %Q1.0 is assigned to multiple variables.A variable was used before being declared, never linked to a physical channel, or two variables ended up on the same address after the equipment list changed.
Work in this order:
If a duplicate address keeps showing after you fixed it, run AutomationView: Refresh Equipment Catalog and validate again. If it persists, open the Machine editor and check that no two modules have overlapping address ranges.