jenkins is not building the lektors since some hours

After the whole weekend doing well, this morning all of the lektor builds are failing:

07:18 <+nsa> or: [jenkins] lektor-website-community-translation-translation#2331: Failure: 
             https://jenkins.torproject.org/job/lektor-website-community-translation-translation/2331/
07:18 <+nsa> or: [jenkins] lektor-website-tor-browser-manual-translation-translation#1250: Failure: 
             https://jenkins.torproject.org/job/lektor-website-tor-browser-manual-translation-translation/1250/
07:27 <+nsa> or: [jenkins] lektor-website-support-translation#2614: Failure: 
             https://jenkins.torproject.org/job/lektor-website-support-translation/2614/
07:27 <+nsa> or: [jenkins] lektor-website-tpo-translation#1928: Failure: 
             https://jenkins.torproject.org/job/lektor-website-tpo-translation/1928/
07:27 <+nsa> or: [jenkins] lektor-website-tor-browser-manual-translation#1692: Failure: 
             https://jenkins.torproject.org/job/lektor-website-tor-browser-manual-translation/1692/
07:47 <+nsa> or: [jenkins] lektor-website-community-translation-translation#2332: Still Failing: 
             https://jenkins.torproject.org/job/lektor-website-community-translation-translation/2332/
07:48 <+nsa> or: [jenkins] lektor-website-tor-browser-manual-translation-translation#1251: Still Failing: 
             https://jenkins.torproject.org/job/lektor-website-tor-browser-manual-translation-translation/1251/
07:49 <+nsa> or: [jenkins] lektor-website-tpo-translation-translation#758: Failure: 
             https://jenkins.torproject.org/job/lektor-website-tpo-translation-translation/758/
07:49 <+nsa> or: [jenkins] lektor-website-support-translation-translation#2013: Failure: 
             https://jenkins.torproject.org/job/lektor-website-support-translation-translation/2013/

I looked onto the Console, i.e. https://jenkins.torproject.org/user/emmapeel/my-views/view/lektorz/job/lektor-website-tor-browser-manual-translation/1692/console , and the only thing it says is that Python is failing to install local packages:

07:27:23   File "/usr/lib/python3/dist-packages/lektor/packages.py", line 274, in update_cache
07:27:23     os.path.join(local_package_path, package[1:]))
07:27:23   File "/usr/lib/python3/dist-packages/lektor/packages.py", line 123, in install_local_package
07:27:23     raise RuntimeError('Failed to install local package')
07:27:23 RuntimeError: Failed to install local package

Maybe it was some update, or something?