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Unable To get the Actions in the step region as I select the Action from the Action Menu


I have successfully deployed the project and now I can find the Actions like "Convert Document", but when I select the option I am unable to get the action on my workflow designer.
I have Installed this on my server with great difficulty, the designer was throwing me an error for SP2010Workflow.Automation dll, which I was suppose it was not able to find, but I again redeployed it Number of Times to finally get rid of the error and find the options. But I am not able to get the Action Script if I choose the option, and also I face No errors.
Can somebody guide me on this issue of mine