Quartus

LVDS receiver <name>, which you assigned to location <name>, cannot have its LVDS input node <name> placed at location <name> because that location is already occupied by node <name>

CAUSE: Because you assigned the specified LVDS receiver to the specified location, you must place its LVDS input node in the specified location. However, that location is already occupied by another node.
ACTION: Assign the LVDS receiver to a different location, replace the existing pin assignment in the location with the pin assignment for the LVDS input node, or delete the assignments for the LVDS receiver or the node, which occupies the specified location.

See also:

Assigning Pins
Changing Assignments
Deleting Assignments in the Assignment Organizer
Overview: Working with Assignments in the Floorplan Editor

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