Hi,
This is probably an add-in you want to load at starting Excel. This is often occuring after an upgrade. I'l ltry to explain, MS gives each application an internal VBA number and if this is not found anymore, you'll get that error. You can try to correct it yourself in case you are the owner of the add-in or you will have to contact the provider.
So most probably a missing reference in VBA/Tools/References.