tex error       > error on line 682 in file /usr/local/texlive/2014/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/datavisualization/tikzlibrarydatavisualization.code.tex: ! Missing number, treated as zero

<to be read again> 

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l.682 {\catcode`\^^

                 M=\active%

672         \def\pgf@temp{#1}%

673         \ifx\pgf@temp\tikz@lib@dv@auto@attribute%

674           \tikzdatavisualizationset{\tikz@dv@axis/label/.expanded=$\noexpand\mathit{\pgfkeysvalueof{\tikz@dv@axis/attribute}}$}%

675         \else

676           \tikzdatavisualizationset{\tikz@dv@axis/label={#1}}%

677         \fi

678       },

679       label/.default=\tikz@lib@dv@auto@attribute,

680       %

681       % Strategies

682 >>    %

683       tick placement strategy/.style={\tikz@dv@axis/@compute at positions={#1}},

684       linear steps/.style={tick placement strategy=\tikz@lib@dv@compute@at@linear},

685       %

686       % Attribute setter

687       %

688       goto/.code={\tikz@dv@goto{\tikz@dv@axis}{#1}},

689       goto pos/.code={\tikz@dv@goto@pos{\tikz@dv@axis}{#1}},

690       anchor at min/.code={\tikz@lib@dv@special@at{\tikz@dv@axis}{\tikz@dv@min@anchor}},

691       anchor at max/.code={\tikz@lib@dv@special@at{\tikz@dv@axis}{\tikz@dv@max@anchor}},

692       %