[0] Config.pm:312> INFO - This is Biber 2.15
[0] Config.pm:315> INFO - Logfile is 'slides.blg'
[109] biber:330> INFO - === So Okt 17, 2021, 20:10:46
[128] Biber.pm:415> INFO - Reading 'slides.bcf'
[212] Biber.pm:952> INFO - Found 0 citekeys in bib section 0
[220] Utils.pm:395> WARN - The file 'slides.bcf' does not contain any citations!
[229] bbl.pm:651> INFO - Writing 'slides.bbl' with encoding 'UTF-8'
[230] bbl.pm:754> INFO - Output to slides.bbl
[230] Biber.pm:128> INFO - WARNINGS: 1