Get rid of error when using \includegraphics<2>{ }?

Question

I had this exact question:

Problem with \only and alignment of graphics (pdf) in beamer

And found the third answer the nicest (in that it worked on the first try):

https://tex.stackexchange.com/a/184533/73454

Doing something like:

\includegraphics<1>[scale=0.7]{pics/List-0.pdf}

Now my problem is that the above although gives a nicely formatted pdf it does however give out erros on compilation (I'm a bit fuzzy on this I'm running latex through the gedit plugin):

graphics `<' not found

So even though it works as I'd like, is there a reason / way to get rid of the error message?

PS. I'm a complete newbie in beamer so please excuse my ignorance.

EDIT:

\documentclass{beamer}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{subfig}
\usepackage{braket}
\usepackage{geometry}
\usepackage{empheq}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[backend=biber,url=false,doi=false,isbn=false,firstinits=true]{biblatex}
\title{Angels and Daemons}
\author{Friendly Monster}
\date{10 March 2015}

\AtBeginSection[]{
\begin{frame}{Outline}
    \tableofcontents[currentsection,hideallsubsections]
\end{frame}}

\begin{document}

    \begin{frame}
        \frametitle{Test Slide}
        \begin{columns}
        \begin{column}{0.5\textwidth}
            Test
            \begin{enumerate}
                \item <1-> Item 1
                \item <2-> Item 2
            \end{enumerate}
        \end{column}
        \begin{column}{0.5\textwidth}
                \includegraphics<1>[width=\textwidth]{fig1.png}
                \includegraphics<2>[width=\textwidth]{fig2.png}
        \end{column}
        \end{columns}
    \end{frame}

\end{document}

EDIT2:

Answer 1

Do not load the subcaption nor the caption package with beamer; beamer has its own ways to handle captions and if you need subfloats, use subfig.

In your case, the problem is even bigger since loading subcaption and subfig will trigger an error message:

! Package subcaption Error: This package can't be used in cooperation
(subcaption)                with the subfig package.

As soon as you remove those packages, your code works as expected:

\documentclass{beamer}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{graphicx}
\usepackage{subfig}
\usepackage{braket}
\usepackage{geometry}
\usepackage{empheq}
\usepackage[backend=biber,url=false,doi=false,isbn=false,firstinits=true]{biblatex}
\title{Angels and Daemons}
\author{Friendly Monster}
\date{10 March 2015}

\AtBeginSection[]{
\begin{frame}{Outline}
    \tableofcontents[currentsection,hideallsubsections]
\end{frame}}

\begin{document}

    \begin{frame}
        \frametitle{Test Slide}
        \begin{columns}
        \begin{column}{0.5\textwidth}
            Test
            \begin{enumerate}
                \item <1-> Item 1
                \item <2-> Item 2
            \end{enumerate}
        \end{column}
        \begin{column}{0.5\textwidth}
                \includegraphics<1>[width=\textwidth]{example-image-a}
                \includegraphics<2>[width=\textwidth]{example-image-b}
        \end{column}
        \end{columns}
    \end{frame}

\end{document}