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With custom workflows in SharePoint you can really make great things about users usability. Did ever happen to you that in one Site Collection you can made custom workflow but in other Site Collection not? And in SharePoint Designer pop-up window with error: “Unable to load workflow actions from the server. Please contact your server administrator.”
If permissions are fine and workflow feature is activated, than this is the quickest way to resolve problem. Go to Site Administration and click on Workflows.
You can see the error, that xml file is not found:
Failed to find the XML file at location ‘14\Template\Features\MissingFeature\feature.xml
How to resolve workflow problem
Found WFE server who have this feature folder in C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\FEATURES\MissingFeature and copy folder to the other WFE server who don’t have this folder.
In my case I have to do it this for 6 times. It’s great you don’t have to reset IIS. And now I can play with workflows again.