Error when opening a project - excel activity

I am having the error when opening a project or running it in a robot machine

Could not find type ‘UpdateLinksExcel.UpdateLinksExcel’ in assembly ‘UpdateLinksExcel’. Row: 2956, Column: 112

Looks like the project was using some custom activities which is not installed in your system. Was there a custom activity developed called ‘UpdateLinksExcel’? If yes then try to get it from the source of the project.

Rammohan B.