Error: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'

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[愿得一人]
[愿得一人] 2020-12-08 04:18

I recently upgraded/updated Entity Framework in an old project from version 4 or 5 to version 6. Now I get this exception:

An exception of type \'Syst

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