ID:178001 Could not find x1 clock line from <name> to <name>

CAUSE: The Fitter could not place the specified blocks in such a way that x1 clock line connectivity requirements between these blocks could be satisfied. The x1 clock lines span only Groups of 6 channels. This message may be displayed because one or more of the specified blocks have location or region constraints that make it impossible to satisfy the x1 clock line requirement.

ACTION: If you made a location assignment to the specified blocks, remove the assignment if possible. If this does not result in a successful fit, compile the design targeting a larger device.