user5700: I cloned the latest Plutus-apps repository:
git clone https://github.com/input-output-hk/plutus-apps
Then afterwards when uploading the latest version with commit hash:git checkout 7f53f18dfc788bf6aa929f47d840efa1247e11fd
Terminal responds with:reference is not a tree: 7f53f18dfc788bf6aa929f47d840efa1247e11fd
What did I do wrong?

user6044: You will need to run
plutus-apps $ git fetch --all

prior to
plutus-apps $ git checkout 7f53f18dfc788bf6aa929f47d840efa1247e11fd

The first one will make sure you have the most recent view of the git repository from upstream. The second will then checkout to the provided revision. git checkout does not automatically do a git fetch.

5700: <p>I cloned the latest Plutus-apps repository:
git clone <a href="https://github.com/input-output-hk/plutus-apps" rel="nofollow noreferrer">https://github.com/input-output-hk/plutus-apps</a></p>
<p>Then afterwards when uploading the latest version with commit hash:git checkout 7f53f18dfc788bf6aa929f47d840efa1247e11fd</p>
<p>Terminal responds with:reference is not a tree: 7f53f18dfc788bf6aa929f47d840efa1247e11fd</p>
<p>What did I do wrong?</p>
 6044: <p>You will need to run</p>
<pre><code>plutus-apps $ git fetch --all
</code></pre>
<p>prior to</p>
<pre><code>plutus-apps $ git checkout 7f53f18dfc788bf6aa929f47d840efa1247e11fd
</code></pre>
<p>The first one will make sure you have the most recent view of the git repository from upstream. The second will then checkout to the provided revision. <code>git checkout</code> does not automatically do a <code>git fetch</code>.</p>
