An error occurred when adding a class library in the blank solution.

Will someone see it? After adding a blank solution, only the class library or website you added will appear when you add a class library or website to it, and the solution will disappear. This is because when you add a class library or website to the blank solution, the class library or website will be added to the folder in the blank solution by default. Now you need to set up vs.net to display the solution. The procedure is: Tools-options-projects and solutions-general. Select "always show SOLUTION. Very simple. Because the solution is also a project, it is equivalent to a class library