"The type 'Regex' exists in both 'System.Text.RegularExpressions"

[msx752]

Severity Code Description Project File Line Suppression State Error CS0433 The type 'Regex' exists in both 'System.Text.RegularExpressions, Version=4.0.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' CoreBot.RocketAPI D:\Github_SourceTree\CoreBotTeam\CoreBot.RocketAPI\Helpers\HtmlRemoval.cs 29 Active

not only 'regex' it happens for every subnamespace of System
two different library have same namespace and there are conflicts,

[msx752]

related with : #7