why can't I import geopandas? : <p>My only line of code is </p>

<pre><code>import geopandas
</code></pre>

<p>and it gives me the error </p>

<pre><code>OSError: Could not find libspatialindex_c library file
</code></pre>

<p>has anyone encountered this before? my script was working just fine until this error came up. </p>

<p>**Note that rtree module not found was an issue fisrt, and upon installation I received the above error instead.</p>
