Line 20 adnxs.com is not the canonical exchange domain. Use appnexus.com instead.
Line 21 adnxs.com is not the canonical exchange domain. Use appnexus.com instead.
Line 22 adnxs.com is not the canonical exchange domain. Use appnexus.com instead.
Line 49 Ad system domain webspectator.com is not a known exchange domain. Ensure the spelling is correct, check the partner documentation, or have the partner update the IAB Tech Lab normalization mappings: https://wiki.iabtechlab.com/index.php?title=Ads.txt_Normalization_Mappings
Line 50 Ad system domain webspectator.com is not a known exchange domain. Ensure the spelling is correct, check the partner documentation, or have the partner update the IAB Tech Lab normalization mappings: https://wiki.iabtechlab.com/index.php?title=Ads.txt_Normalization_Mappings