The type or namespace name 'Testing' does not exist in the namespace 'osu.Framework' (are you missing an assembly reference?)

The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'Testing' does not exist in the namespace 'osu.Framework' (are you missing an assembly reference?)

The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)

Missing XML comment for publicly visible type or member 'Application'

Missing XML comment for publicly visible type or member 'Application.Main(string[])'

Missing XML comment for publicly visible type or member 'Application'