ID:18108 Can't place multiple pins assigned to pin location <name> (<name>)

CAUSE: You assigned two or more pins to the specified location, but the Fitter cannot place all the pins in that location.

ACTION: If the conflict arises from location assignments in the current project, delete or change the location assignment of one or more of the pins. If the pin location assignments come from one or more imported design partitions, delete or change the location assignment (possibly using the Virtual Pin assignments) in the lower-level designs, re-generate the Quartus II Exported Partition File(s) (.qxp) , and re-import.