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Application error when access /_layouts/mngfield.aspx
 
If you came across this web site and searching for next SharePoint error message, please read on, you will find the solution.
 
Application error when access /_layouts/mngfield.aspx, Error=Object reference not set to an instance of an object.   at Microsoft.SharePoint.ApplicationPages.FieldListRenderer.Render(HtmlTextWriter output)     at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)     at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)     at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)     at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)     at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)     at System.Web.UI.Control.Render(HtmlTextWriter writer)     at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)     at System.Web.U... 
This is a bug of SharePoint. When you created your web site, your url could be http://server/sites/Hawaii. You are trying to create a custom column definition and activate it through a feature by command line as
 

stsadm.exe -o activatefeature -name %featureName% -url http://server/sites/hawaii -force

Notice in the url you are using different case than the site your created. This is will cause problem. Use the same case in feature activation will solve the problem.