title: how to solve Jenkins Build Failed Error :MSB4041
body: <p>I have build this project as .Net standard project and i am facing this error issue in jenkins when I build this project:</p>
  
  <blockquote>
    <p>C:\Users\tahab.jenkins\workspace\Mondaytest\Calculator\Calculator.csproj(1,1):
    error MSB4041: The default XML namespace of the pr.oject must be the
    MSBuild XML namespace. If the project is authored in the MSBuild 2003
    format, please add
    xmlns="http://schemas.microsoft.com/developer/msbuild/2003" to the
     element. If the project has been authored in the old 1.0 or
    1.2 format, please convert it to MSBuild 2003 format</p>
  </blockquote>