I have recently installed Revit 2021 and for my family, I can only access UK and US imperial.
I have been trying to load family to get the structural framing from the UK imperial and I keep getting the pop-up saying unable to load component and to choose a family from the category component.
I have tried doing it all from scratch but I keep getting the same pop-up.
Try installing hotfixes 2021.1.5.
Thank you for the question @sharmista.deb25 and welcome to the Autodesk forum!
The Component command is used for placing free standing components. I believe the reason you are getting that message is that the Structural Trusses do not qualify as component families.
To load the families, use the Insert -> Load Family command. For more details see this article: "Cannot Load Family Files...You must choose family files of the category..." when trying to load fam...

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