Unable to build Golden Top for Arria 10 SoC dev kit.

I am trying to build the latest golden_top from /arria10_10as066n3f40_soc_v15.1.2/examples/golden_top/PRD/golden_top for my Arria10 SoC dev kit. However, it fails during place and route.

Here are the errors I'm receiving:

Error (12342): Can't turn on open-drain option for differential I/O pin DP_AUX_CH_N

Error (12342): Can't turn on open-drain option for differential I/O pin DP_AUX_CH_P

I'm not sure why I would get this error on a reference design, nor am I quite sure of what, if anything I can/should do about it.

Help would be appreciated.

Dave