There are a extra "\" in the beginning of the file "pgfplots.revision.tex". I have
\\begingroup <--- should be \begingroup
\\catcode`\\/=12
\\catcode`\\.=12
\\catcode`\\:=12
\\catcode`\\+=12
\\catcode`\\-=12
\gdef\pgfplotsrevision{1.11-232-g91e635c}
\gdef\pgfplotsversion{1.11}
\gdef\pgfplotsversiondatetime{2014-08-04 12:47:48 +0200}
\gdef\pgfplotsrevisiondatetime{2015-01-04 21:23:44 +0100}
\gdef\pgfplots@glob@TMPa#1-#2-#3 #4\\relax{#1/#2/#3}
\xdef\pgfplotsversiondate{\expandafter\pgfplots@glob@TMPa\pgfplotsversiondatetime\\relax}
\xdef\pgfplotsrevisiondate{\expandafter\pgfplots@glob@TMPa\pgfplotsrevisiondatetime\\relax}
\endgroup