a i m l e s s

Category Order could not understand your category HTML. Please do the following:

Disable all plugins except for category order to see if some other plugin is causing the problem. If the problem goes away, re-enable each plugin until you find the incompatible one.
Try switching to a different theme, like the WordPress default theme.

Once you have tried the above steps, email david@coppit.org with the results of these debugging steps. Also include the following information:

Original HTML:
<li class="cat-item cat-item-1232"><a href="https://blogs.bootsnall.com/aimless/category/cambodia" >Cambodia</a>
</li>
<li class="cat-item cat-item-272"><a href="https://blogs.bootsnall.com/aimless/category/costa-rica" >Costa Rica</a>
</li>
<li class="cat-item cat-item-135"><a href="https://blogs.bootsnall.com/aimless/category/france" >France</a>
</li>
<li class="cat-item cat-item-1566"><a href="https://blogs.bootsnall.com/aimless/category/india" >India</a>
</li>
<li class="cat-item cat-item-267"><a href="https://blogs.bootsnall.com/aimless/category/ireland" >Ireland</a>
</li>
<li class="cat-item cat-item-17"><a href="https://blogs.bootsnall.com/aimless/category/italy" >Italy</a>
</li>
<li class="cat-item cat-item-963"><a href="https://blogs.bootsnall.com/aimless/category/japan" >Japan</a>
</li>
<li class="cat-item cat-item-2316"><a href="https://blogs.bootsnall.com/aimless/category/laos" >Laos</a>
</li>
<li class="cat-item cat-item-2178"><a href="https://blogs.bootsnall.com/aimless/category/morocco" >Morocco</a>
</li>
<li class="cat-item cat-item-273"><a href="https://blogs.bootsnall.com/aimless/category/nicaragua" >Nicaragua</a>
</li>
<li class="cat-item cat-item-26203"><a href="https://blogs.bootsnall.com/aimless/category/panama-2" >Panama</a>
</li>
<li class="cat-item cat-item-11716"><a href="https://blogs.bootsnall.com/aimless/category/sentiment" title="Ramblings and photos on things close to the heart">Sentiment</a>
</li>
<li class="cat-item cat-item-3705"><a href="https://blogs.bootsnall.com/aimless/category/south-korea" >South Korea</a>
</li>
<li class="cat-item cat-item-693"><a href="https://blogs.bootsnall.com/aimless/category/spain" >Spain</a>
</li>
<li class="cat-item cat-item-2340"><a href="https://blogs.bootsnall.com/aimless/category/taiwan" >Taiwan</a>
</li>
<li class="cat-item cat-item-961"><a href="https://blogs.bootsnall.com/aimless/category/thailand" >Thailand</a>
</li>
<li class="cat-item cat-item-132"><a href="https://blogs.bootsnall.com/aimless/category/travel" title="Experiences and adventures">Travel</a>
</li>
<li class="cat-item cat-item-2018"><a href="https://blogs.bootsnall.com/aimless/category/uk" >UK</a>
</li>
<li class="cat-item cat-item-268"><a href="https://blogs.bootsnall.com/aimless/category/usa" >USA</a>
</li>
<li class="cat-item cat-item-964"><a href="https://blogs.bootsnall.com/aimless/category/vietnam" >Vietnam</a>
</li>

Processed HTML:
<li class="cat-item cat-item-1232"><a href="https://blogs.bootsnall.com/aimless/category/cambodia" >Cambodia</a>
</li>
<li class="cat-item cat-item-272"><a href="https://blogs.bootsnall.com/aimless/category/costa-rica" >Costa Rica</a>
</li>
<li class="cat-item cat-item-135"><a href="https://blogs.bootsnall.com/aimless/category/france" >France</a>
</li>
<li class="cat-item cat-item-1566"><a href="https://blogs.bootsnall.com/aimless/category/india" >India</a>
</li>
<li class="cat-item cat-item-267"><a href="https://blogs.bootsnall.com/aimless/category/ireland" >Ireland</a>
</li>
<li class="cat-item cat-item-17"><a href="https://blogs.bootsnall.com/aimless/category/italy" >Italy</a>
</li>
<li class="cat-item cat-item-963"><a href="https://blogs.bootsnall.com/aimless/category/japan" >Japan</a>
</li>
<li class="cat-item cat-item-2316"><a href="https://blogs.bootsnall.com/aimless/category/laos" >Laos</a>
</li>
<li class="cat-item cat-item-2178"><a href="https://blogs.bootsnall.com/aimless/category/morocco" >Morocco</a>
</li>
<li class="cat-item cat-item-273"><a href="https://blogs.bootsnall.com/aimless/category/nicaragua" >Nicaragua</a>
</li>
<li class="cat-item cat-item-26203"><a href="https://blogs.bootsnall.com/aimless/category/panama-2" >Panama</a>
</li>
<li class="cat-item cat-item-11716"><a href="https://blogs.bootsnall.com/aimless/category/sentiment" title="Ramblings and photos on things close to the heart">Sentiment</a>
</li>
<li class="cat-item cat-item-3705"><a href="https://blogs.bootsnall.com/aimless/category/south-korea" >South Korea</a>
</li>
<li class="cat-item cat-item-693"><a href="https://blogs.bootsnall.com/aimless/category/spain" >Spain</a>
</li>
<li class="cat-item cat-item-2340"><a href="https://blogs.bootsnall.com/aimless/category/taiwan" >Taiwan</a>
</li>
<li class="cat-item cat-item-961"><a href="https://blogs.bootsnall.com/aimless/category/thailand" >Thailand</a>
</li>
<li class="cat-item cat-item-132"><a href="https://blogs.bootsnall.com/aimless/category/travel" title="Experiences and adventures">Travel</a>
</li>
<li class="cat-item cat-item-2018"><a href="https://blogs.bootsnall.com/aimless/category/uk" >UK</a>
</li>
<li class="cat-item cat-item-268"><a href="https://blogs.bootsnall.com/aimless/category/usa" >USA</a>
</li>
<li class="cat-item cat-item-964"><a href="https://blogs.bootsnall.com/aimless/category/vietnam" >Vietnam</a>
</li>

Category pattern:
/http\:\/\/blogs\.bootsnall\.com\/aimless.*?\/category\/(?:[^\/"]+\/)*([^\/"]+)/

Items:
Array
(
    [0] => <li class="cat-item cat-item-1232"><a href="https://blogs.bootsnall.com/aimless/category/cambodia" >Cambodia</a> </li>
    [1] => <li class="cat-item cat-item-272"><a href="https://blogs.bootsnall.com/aimless/category/costa-rica" >Costa Rica</a> </li>
    [2] => <li class="cat-item cat-item-135"><a href="https://blogs.bootsnall.com/aimless/category/france" >France</a> </li>
    [3] => <li class="cat-item cat-item-1566"><a href="https://blogs.bootsnall.com/aimless/category/india" >India</a> </li>
    [4] => <li class="cat-item cat-item-267"><a href="https://blogs.bootsnall.com/aimless/category/ireland" >Ireland</a> </li>
    [5] => <li class="cat-item cat-item-17"><a href="https://blogs.bootsnall.com/aimless/category/italy" >Italy</a> </li>
    [6] => <li class="cat-item cat-item-963"><a href="https://blogs.bootsnall.com/aimless/category/japan" >Japan</a> </li>
    [7] => <li class="cat-item cat-item-2316"><a href="https://blogs.bootsnall.com/aimless/category/laos" >Laos</a> </li>
    [8] => <li class="cat-item cat-item-2178"><a href="https://blogs.bootsnall.com/aimless/category/morocco" >Morocco</a> </li>
    [9] => <li class="cat-item cat-item-273"><a href="https://blogs.bootsnall.com/aimless/category/nicaragua" >Nicaragua</a> </li>
    [10] => <li class="cat-item cat-item-26203"><a href="https://blogs.bootsnall.com/aimless/category/panama-2" >Panama</a> </li>
    [11] => <li class="cat-item cat-item-11716"><a href="https://blogs.bootsnall.com/aimless/category/sentiment" title="Ramblings and photos on things close to the heart">Sentiment</a> </li>
    [12] => <li class="cat-item cat-item-3705"><a href="https://blogs.bootsnall.com/aimless/category/south-korea" >South Korea</a> </li>
    [13] => <li class="cat-item cat-item-693"><a href="https://blogs.bootsnall.com/aimless/category/spain" >Spain</a> </li>
    [14] => <li class="cat-item cat-item-2340"><a href="https://blogs.bootsnall.com/aimless/category/taiwan" >Taiwan</a> </li>
    [15] => <li class="cat-item cat-item-961"><a href="https://blogs.bootsnall.com/aimless/category/thailand" >Thailand</a> </li>
    [16] => <li class="cat-item cat-item-132"><a href="https://blogs.bootsnall.com/aimless/category/travel" title="Experiences and adventures">Travel</a> </li>
    [17] => <li class="cat-item cat-item-2018"><a href="https://blogs.bootsnall.com/aimless/category/uk" >UK</a> </li>
    [18] => <li class="cat-item cat-item-268"><a href="https://blogs.bootsnall.com/aimless/category/usa" >USA</a> </li>
    [19] => <li class="cat-item cat-item-964"><a href="https://blogs.bootsnall.com/aimless/category/vietnam" >Vietnam</a> </li>
)