App Store greyed out
Hello,
So it's been a while that I cannot use my App Store on my Mac. It's greyed out and the options are unresponsive. I've logged out then tried to log back in, but I have a "an unexpected error occurred while signing in. Fail"
My App Store works under Safe boot mode. So I don't know the reason why.
I've made sure my App Store location was well in France where my Itunes account is located.
So I don't see any solutions.
Thanks
MacBook, macOS Sierra (10.12.6)