Cubase 11- Suddenly, my "Spitfire Audio" Sampler/Instruments moved to "Blocklist"

I’ve been using SPITFIRE LABs & three other instruments from “Spitfire Audio” for the last 6 months on my Cubase pro11 projects without an issue, until today.
Suddenly, I can not load those Spitfire LABs/Samplers plugins into my last project that I made 2 days ago (without any problems).