Xert not calculating signature

Hi all, hope someone can help, having a problem with xert after a very hard ride…
set a PR on a 7 km climb with a very hard effort (especially the first part) but xert shows 18 minutes of “efforts over mpa” but wont recalculate my ftp. doing “extract” gives an error message. How do go i get xert to work again?
activity in strava https://www.strava.com/activities/2797311055
in xert https://www.xertonline.com/activities/wxjo8jehrsqdgvrb