ID:176507 Can't place DLL "<name>" in location <name> -- can't also place reference clock I/O "<name>"

CAUSE: The Fitter could not place the specified delay locked loop (DLLs) in the specified location because its reference clock I/O could not be placed in the I/O locations that can feed this DLL. You may have made location assignments which resulted in the Fitter attempting to place the DLL in the specified location. If you did not make a location assignment, the specified location represents the last location in which the Fitter attempted to place the specified DLL.

ACTION: If you made location assignments to the specified DLL or its reference clock I/O, remove the location assignment. Otherwise, remove location assignments to other related nodes. If this does not result in a successful fit, compile the design targeting a larger device.