How to fix Error: “Could not find schema information for the attribute/element” by creating schema

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Quickest, easiest laziest way to solve the problem:

  1. Right-click on the project icon in Solution Explorer and choose “Properties”.
  2. Go to the “Application” tab and choose an earlier .NET target framework.
  3. Save changes.
  4. Go to the “Application” tab and choose the initial .NET target framework.
  5. Save changes => problem solved!

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