Perhaps, after the annual update of Windows 10 you need to specify the full path for System.Globalization for the web site

Error: path \ file (string): error BC30561: "Globalization" imported from namespaces or types "System.Web, System" is ambiguous.

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    1 answer 1

    Faced exactly the same problem. Adding System decided everything. Although System is drawn as a redundant.

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      Please write a more detailed answer. - approximatenumber