AlbertKessler after installing this I received this error message ...
It's not clear what happened after you saw that message. Did Windows start, but not Solus? Did Solus start, but not Windows? Did neither OS launch?
I'm not an expert on dual-boot matters, because I don't do that, but for someone else to help you, they'll probably need to know what's actually happening, like where that message originated. Best of luck with getting the help you need.