Whilst working on a recently upgraded SharePoint 2010 site (database attach upgrade) I attempted to modify an existing web part. As soon as the page went into edit mode I was presented with the following SharePoint error: “One or more field types are not installed properly. Go to the list settings page to delete these fields.”
This appears to be a random bug which seems to occur with some sites after they have been upgraded and is related to a list called ‘Relationships List’.
To fix this de-activate the SharePoint Server Publishing Infrastructure Feature in the sites settings, delete the Relationships List and re-activate the feature.
The Microsoft Cloud Blog 
In my instance this is on the root site and there is no option to delete the list as you would normally see. Am I missing a step in deleting the list?
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Hi Rusty
I don’t think that this list is accessible via the UI, you need to use the URL to get to the list instead, for example http://%5Bsite name]/Relationships%20List/AllItems.aspx
Hope this helps
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Realize this is an older post, however, others may still have same issue.
There may be a simpler solution. Following the upgrade, SharePoint may have tried to reinstall the SharePoint Solution and gotten hung-up.
Try going to Central Administration –> System Settings –> Manage Farm Solutions.
Cancel the deployment. Then Redeploy the solution.
This cleared-up the issues for me.
Thanks to: http://ybbest.wordpress.com/2011/09/10/how-to-fix-%e2%80%9ca-deployment-or-retraction-is-already-under-way-for-the-solution-%e2%80%9c-wsp%e2%80%9d-and-only-one-deployment-or-retraction-at-a-time-is-supported%e2%80%9d/#comment-2099
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