Re-install Office, making sure the “.net Programmability Support” is selected.
Here are a couple of links regarding this...
https://docs.oracle.com/cd/E16162_01/web.1112/e16180/inst_conf_dev_env.htm#ADFDI61399
https://docs.microsoft.com/en-us/visualstudio/vsto/how-to-install-office-primary-interop-assemblies?view=vs-2019