Hi,
While using tikzexternalize together with the multibib package, the system does not compile the external files. I have a MWE (or better: not working) example attached. The file works, if I dont have multiple bibliographies in the document, i.e. if I comment out these two lines:
\bibliographystylejournal{myplain}
\bibliographyjournal{library}
The error that is popping up during compilation of the external picture is
LaTeX Warning: Citation `Michailow2015' undefined on input line 23.
! Missing \endcsname inserted. <to be read again> \jobname l.26 \bibliographyjournal{library}
(see file external/main-figure0.log)
I also attach the make-file (a window batch file) to show the commands I used, including the log files that were generated on my PC. Thanks for taking a look at it!
Max