From XlslO example
CS7069 : Reference to type 'Task<>' claims it is defined in 'System.Runtime', but it could not be found.
can't run and get above error. After some googling and found someone said entering #r "System.Runtime" in C# Interactive can solve. But unfortunately, this can't solve for mine. I'm using VS community 2017 Version 15.9.7 and UWP application(Target version : Window 10, version 1803<10.0;Build17134>).
Added XlslO from reference -> Universal Windows -> Extensions -> Syncfusion Controls for UWP XAML 184.108.40.206