UiPath Package using error

Hello guys,
I’m trying to use UiPath’s feature packages such as excel, PDF, DB etc…

I’m in cloud PC with non-external-internet environment. And what I tried was upload the packages(.nupkg, .dll) in NAS Server, and put them into the \AppData\Local\UiPath\Activity folder. But, It doesn’t worked. We tried this method before, and it worked very well. I can’t estimate what is the reason.
Also, following error message is shown when I run the UiPath Studio.
: Error : Could not find “LogMessage in namespace ‘http://schemas.uipath.com/workflow/activities’, Row:89, Column:30”

Does anybody could give me an advice or a solution for me?
Plz help!

Thank you!