Invalid xml:base in Teamcity nuget feed -

i try setup teamcity nuget feed. when try download package form nuget server next error in vs output window:

when try definition of nuget feed see next:

in administration / global settings / server url have valid dmin name of server. how can change xml:base attribute in feed definition?

i don't think there issue teamcity. can see hosting teamcity locally on development machine , downloading own packages (1st picture). error seeing in chrome absolutely fine.

however issue appears having have not configured either visualstudio or solution in visualstudio download more 1 place. package failing nancyfx presumably not hosting teamcity therefore need go , public nuget server. in order achieve either have configure visualstudio or solution file search multiple package sources.

https://docs.nuget.org/ndocs/tools/package-manager-ui#package-sources