ID:19688 Placement failed to find a legal solution due to row legality failure, additional legalization operations will be performed. This failure may inadvertently affect the timing results.

CAUSE: Legal location for a placement object cannot be found due to row legality failure. It may be caused by too many clocks in a location.

ACTION: Please try the placement again with a different seed. If all seeds have the same warning, please try reducing the congestion of clocks by creating disjoint clock regions.