I found out I put in a bad version of the search code in the partial.
After learning this and finding the correct code, I placed the correct
code in place of the bad code.
-<form role="search" method="get" class="searchform" action="<?php echo home_url('/'); ?>">
- <input class="search-input" type="text" placeholder="Search" value="" name="s">
+<form role="search" method="get" class="searchform" action="<?php echo home_url('/').'site-search/'; ?>">
+ <input class="search-input" type="text" placeholder="Search" value="" name="query">
<input class="search-button button" type="submit" value="Search" name="submit">
</form>
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