Use of uninitialized value $ENV{"USER"} in concatenation (.) or string at /usr/bin/latexmk line 926.
Latexmk: This is Latexmk, John Collins, 10 Nov 2013, version: 4.39.
**** Report bugs etc to John Collins <collins at phys.psu.edu>. ****

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Latexmk: Could not find file [Ausarbeitungausarbeitung.tex].
-- Use the -f option to force complete processing.

ERROR: Build failed: exit code 1