trying to make watermark

gistfile1.txt

[sam@SamHPUMBP:~/Documents/Github/saasbook/saasbook (master)]$ make pdf WATERMARK='Indra Nurdjaja\\inurjaya@gmail.com'
pdflatex saasbook_pdf
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Writing index file saasbook_pdf.idx
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(./saasbook_pdf.out) (./saasbook_pdf.out)

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Package minitoc(hints) Warning: W0028
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Package minitoc(hints) Warning: W0023
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*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
ABD: EverySelectfont initializing macros (./saasbook_frontmatter.tex
! Undefined control sequence.
\watermarktext ->Indra Nurdjaja\inurjaya 
                                         @gmail.com
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\@begindvi ->\sc@everypage@hook 
                                \sc@thispage@hook \gdef \sc@thispage@hook {}...

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<output> ...specialoutput \else \@makecol \@opcol 
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                                                  \@checkend {#1}\expandafte...

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                                                  \setcounter {footnote}{0}\...

\reserved@c ->\HyOrg@maketitle 
                               \Hy@maketitle@end 
<to be read again> 
                   \input 
l.5   \input
            {frontmatter/titlepage}\flushpage
?