Quartus

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

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

See also:

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

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