This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2015/dev/Debian) (preloaded format=pdflatex 2017.4.13)  12 MAY 2017 13:02
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**slides.tex

! Emergency stop.
<*> slides.tex
              
End of file on the terminal!

 
Here is how much of TeX's memory you used:
 3 strings out of 494996
 115 string characters out of 6180489
 46063 words of memory out of 5000000
 3330 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 16 hyphenation exceptions out of 8191
 0i,0n,0p,13b,6s stack positions out of 5000i,500n,10000p,200000b,80000s
!  ==> Fatal error occurred, no output PDF file produced!