c# - Xamarin.Forms Reference conflict -

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my problem in xamarin.forms

i tried use class reachability.cs xamarin (downloaded official source) used check url or ip address reachable.

when try build shows me following error message:

reference type 'ipaddress' claims defined in 'system', not found

i dont know how solve usings 

using system; using systemconfiguration; using corefoundation;

enter image description here

kind regards,

stefan

reachability.cs depends on system.net classes not exist in pcl. test reachability in forms, use connectivity plugin instead.


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