When adding a class library to an ASP.NET 5 application you might get an error like
“The following projects are not supported as references: – The project ClassLibrary1 has a target framework that is incompatible or has a version higher than the current project and cannot be referenced”
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The cause is most likely that when you created the project ClassLibrary1 you selected “Class Library” as the type of project as shown here.
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Instead, you should have selected “Class Library (Package)”.
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