vba error 429 activex component can't create object

I am trying to create object of staad pro in excel using "Set objOpenSTAAD = GetObject(, "StaadPro.OpenSTAAD")" but i am getting Run Time error '429'. In Excel i am given reference to the Staad.DLL library (i.e Open STaad) . Please help me to solve this issue as early as possible.

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