Constantly getting compilation error. Cannot automate


I have tried numerous times restarting my system and UiPath studio. please advice

Also getting the follwoing error:

Error when i try to compile:

Unexpected error has occurred during the library compilation process:
Unable to create activity builder for CreateIndicationTemplates.xaml. Reason was ‘Cannot create unknown type ‘{clr-namespace:UiPath.Excel.Activities.Business;assembly=UiPath.Excel.Activities}SequenceX’.’.