File scrlayer-scrpage.sty cannot be found [closed]

Question

The following code leads to an error

! LaTeX Error: File `scrlayer-scrpage.sty' not found.

Here is my code:

\documentclass[fontsize=10,a4paper,twoside]{scrreprt}
\usepackage[T1]{fontenc}
\usepackage[automark,headsepline,footsepline]{scrlayer-scrpage}
\usepackage[utf8]{inputenc}
\usepackage[frenchb]{babel}
\usepackage{a4}

\usepackage{scrpage2}
\KOMAoptions{BCOR=2mm,DIV=15}

\pagestyle{scrheadings}
\cfoot{Le pied de page}
\lehead{En haut à gauche pair}
\lohead{En haut à gauche impair}
\cehead{centre pair}
\cohead{centre impair}

\begin{document}
My first latex document

Hello world !
\end{document}

I don't understand why since KOMA-script is installed (if I remove the scrlayer-scrpage line, it works). I run pdftex under Mac OSX 10.9.1 (pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013)).

What should I do to use scrlayer-scrpage package ?

EDIT: THE SOLUTION

As indicated in comments, the problem came from an incomplete update of the packages. So contacting the responsible for scrlayer-scrpage package was the solution, and then update your installation.