changing target-framework causes error in visual studio 2015

Question

I changed in project.json the section of target-framework from

  "frameworks": {
    "dotnet": { }
  }

to

  "frameworks": {
    "dnx451": {
      "dependencies": {
      }
    },
    "dnxcore50": {
      "dependencies": {
        "System.Collections": "4.0.10-beta-23019",
        "System.Console": "4.0.0-beta-23019",
        "System.Linq": "4.0.0-beta-23019",
        "System.Threading": "4.0.10-beta-23019",
        "Microsoft.CSharp": "4.0.0-beta-23019"
      }
    }

when trying to get into the settings of the project, the tab opens with following exception:

Fehler beim Laden des Projekteigenschaftenfensters. Schließen Sie das Fenster, und versuchen Sie es noch einmal. Ein COM-Objekt, das vom zugrunde liegenden RCW getrennt wurde, kann nicht verwendet werden.

(means something like "error when loading the projects settings-window. close the window and try again. A COM-Object trimmed from RCW can't be used) I tried again to open the window - same error again. I changed back to the previous but this didn't help neither. I can't even open the settings-window from another project anymore (that definitely worked before).

Any ideas how to fix this?

Answer 1

目标框架在Properties中更改目标框架，在下拉菜单中可以选择新框架。

Answer 2

Try to change it back to what it was originally in the project.json. Try to open properties again.

If you create a new project and open properties does it give you the same error.