! LaTeX Error: File `mathtools.sty' not found.
Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)
Enter file name:
! Emergency stop.
*** (cannot \read from terminal in nonstop modes)
Here is how much of TeX's memory you used:
933 strings out of 495061
9434 string characters out of 1182620
58609 words of memory out of 3000000
4164 multiletter control sequences out of 15000+50000
4702 words of font info for 16 fonts, out of 3000000 for 9000
28 hyphenation exceptions out of 8191
24i,0n,19p,199b,38s stack positions out of 5000i,500n,10000p,200000b,50000s
! ==> Fatal error occurred, no output PDF file produced!