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Now I am new to SharePoint I mostly do programming. Our SharePoint Admin set up a new site on our farm and wanted to reuse the Master page. We moved the master page and a SharePoint solution associated with it. We activated everything but still get an error. The error points to the solution as not being there but it is and is activated so I cannot understand the issue.

This is the error we receive.

Error Message

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The custom master page probably embeds a custom control. This requires the web.config to be edited so this new type is allowed on the Web application. Deploying the WSP package to that Web application (from CA) should automatically add the missing entries (SafeControls) in the corresponding web.config file.

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  • Wouldn't the current Webconfig already have it. This is what our SharePoint Admin emailed me with. I’m building a new site for Corpxxx to replace the old one on WSS 2007. xxx.xxx.com/SitePages/Home.aspx I looked at how it was setup on SharePointhub and copied what I could find over to this new site. But when I change the Master Page to the XXX\onexxxmaster_teamAccortion masterpage see error below. I’ve enabled the HorizontalMenu as a site collection feature, I must be missing it somewhere else as well.
    – Greatwhite
    Sep 2, 2015 at 13:55
  • Activating the feature may still be possible, even if the solution was not deployed on that Web application. Deploying the WSP (SharePoint solution) to one Web application will make the feature available for all of them, but the web.config won't be edited for new safe controls on other Web apps.
    – Evariste
    Sep 2, 2015 at 16:07
  • OK so we checked the Webconfig file and found that the safe control wasn't listed so we added it. Tried again and still the same error. We are going to reset IIS and see what that does.
    – Greatwhite
    Sep 2, 2015 at 16:37
  • Editing the web.config file already triggers a kind of reset (recompilation). But, anyway: you should not do that manually, but rely on the solution deployment (that will ensure all servers in the farm as in sync + may have other impact).
    – Evariste
    Sep 2, 2015 at 17:16
  • So you should not import a Solution from one site to another? It must be deployed instead?
    – Greatwhite
    Sep 2, 2015 at 17:58

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