My 2019-01-12 workout-0 needs a fitness signature update, I’m afraid.
Xert failed to do that automatically upon upload.
So, in order to force a manual extraction I tried and run ‘Advanced MPA\Extract’.
Sadly, this is what I get System unable to extract fitness signature .
What’s wrong with this workout and why Xert can’t extract a new fitness signature neither automatically nor manually?
This is a bit annoying as this error has negative effects on my Training Status, Traning Load, XATA, etc.
THX for your help 
Unless you have a major breakthrough, it shouldn’t have a material impact. Sometimes when there are very sharp breakthroughs that don’t fit in with what you have normally done, this error can occur. You can try and experiment with different signatures and use the Refresh feature if you feel there is a need to determine the signature for the activity. If you’re still stuck, send a note to support and we can have a look.
Everything should be ok now. Nice work!! Fantastic effort.
Everything should be ok now.
Thank you so much, Armando!
This is the helpful Armando I used to know! 
Ciao, Lorenzo (one of the thousands satisfied XERT users).
“Give a man a fish, and you feed him for a day. Teach a man to fish, and you feed him for a lifetime.”