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I'm extremely new to SharePoint and most definitely not our company's SharePoint dev. They set me up with a WebPart and its project where I can write some code.

The page was working perfectly fine when in a Sandbox. I needed to unsandbox it, so I can send out emails, and only flipping the "Sandbox" bit and changing literally nothing else, following a deploy I now get a

Web Part Error: The request could not be completed because the specified solution was not found.

When reverting back to a Sandbox it starts working again. Any chance this is a simple fix ?

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I suggest to

  • backup your solution ,
  • go to project properties , set sandbox solution to false

  • Apply the steps on each project in the current solution

  • Save and reopen the solution again,

  • build and deploy

Hope it helps !

  • Turned out flipping it back and forth most likely changes the WebPart's ID back and forth. It required removing the webpart and adding it again. Thanks anyway. – Иво Недев Nov 7 '18 at 8:52

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