After yesterday's update of biber from 2.11 to 2.15 it doesn't work with the biblatex 3.11 (which comes with texlive version 20180414) anymore:
biber build/Projekt INFO - This is Biber 2.15 INFO - Logfile is 'build/Projekt.blg' INFO - Reading 'build/Projekt.bcf' ERROR - Error: Found biblatex control file version 3.4, expected version 3.7. This means that your biber (2.15) and biblatex (3.11) versions are incompatible. See compat matrix in biblatex or biber PDF documentation. INFO - ERRORS: 1
For the compatibility matrix please see:
http://mirrors.ibiblio.org/CTAN/biblio/biber/documentation/biber.pdf
So please either update texlive or revert the biber update.
Thank you!
(And from a long time lurker: Thanks for all your hard work!)