thismonth, 1, $thisyear);

        $last_day = gmdate('t', $unixmonth);

        $previous = $wpdb->get_row("SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
    		FROM $wpdb->posts
    		WHERE post_date < '$thisyear-$thismonth-01 00:00:00'
    		AND post_type = 'post' AND post_status = 'publish'
    			ORDER BY post_date DESC
    			LIMIT 1");

        $next = $wpdb->get_row("SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
    		FROM $wpdb->posts
    		WHERE post_date > '$thisyear-$thismonth-{$last_day} 23:59:58'
    		AND post_type = 'post' AND post_status = 'publish'
    			ORDER BY post_date ASC
    			LIMIT 1");

        $calendar_caption = _x('%1$s %2$s', 'calendar caption');

        $mstamp = mktime(0, 0, 0, $thismonth, 1, $thisyear);
        $famonth = $this->shamsi(null, 'F', $mstamp);

        $calendar_output = '<table id="wp-calendar" class="wp-calendar-table">
    	<caption>' . sprintf($calendar_caption, $famonth, $this->shamsi(gmdate('Y', $unixmonth), 'Y')) . '</caption>
    	<thead>
    	<tr>';

        $myweek = array();

        for ($wdcount = 0; $wdcount <= 6; $wdcount++) {
            $myweek[] = $wp_locale->get_weekday(($wdcount + $week_begins) % 7);
        }

        foreach ($myweek as $wd) {
            $day_name = $initial ? $wp_locale->get_weekday_initial($wd) : $wp_locale->get_weekday_abbrev($wd);
            $wd = esc_attr($wd);
            $calendar_output .= "\n\t\t<th scope=\"col\" title=\"$wd\">$day_name</th>";
        }

        $calendar_output .= '
    	</tr>
    	</thead>
    	<tbody>
    	<tr>';

        $daywithpost = array();

        $dayswithposts = $wpdb->get_results("SELECT DISTINCT DAYOFMONTH(post_date)
    		FROM $wpdb->posts WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:01'
    		AND post_type = 'post' AND post_status = 'publish'
    		AND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59'", ARRAY_N);

        if ($dayswithposts) {
            foreach ((array)$dayswithposts as $daywith) {
                $daywithpost[] = (int)$daywith[0];
            }
        }

        $pad = calendar_week_mod(gmdate('w', $unixmonth) - $week_begins);
        if (0 != $pad) {
            $calendar_output .= "\n\t\t" . '<td colspan="' . esc_attr($pad) . '" class="pad">&nbsp;</td>';
        }

        $monthnum = ($this->shamsi(null, 'm', $mstamp) < 7) ? 31 : 30;

        $newrow = false;
        $daysinmonth = $monthnum;

        for ($day = 1; $day <= $daysinmonth; ++$day) {

            $jstamp = mktime(0, 0, 0, $thismonth, $day, $thisyear);

            $faday = $this->shamsi(null, 'd', $jstamp);

            if (isset($newrow) && $newrow) {
                $calendar_output .= "\n\t</tr>\n\t<tr>\n\t\t";
            }
            $newrow = false;

            if (current_time('j') == $day && current_time('m') == $thismonth && current_time('Y') == $thisyear) {
                $calendar_output .= '<td id="today">';
            } else {
                $calendar_output .= '<td>';
            }

            if (in_array($day, $daywithpost, true)) {
                $date_format = gmdate(_x('F j, Y', 'daily archives date format'), strtotime("{$thisyear}-{$thismonth}-{$day}"));

                $label = sprintf(__('Posts published on %s'), $this->shamsi($date_format, _x('F j, Y', 'daily archives date format')));
                $calendar_output .= sprintf('<a href="%s" aria-label="%s">%s</a>', get_day_link($thisyear, $thismonth, $day), esc_attr($label), $faday);
            } else {
                $calendar_output .= $faday;
            }

            $calendar_output .= '</td>';

            if (6 == calendar_week_mod(gmdate('w', mktime(0, 0, 0, $thismonth, $day, $thisyear)) - $week_begins)) {
                $newrow = true;
            }
        }

        $pad = 7 - calendar_week_mod(gmdate('w', mktime(0, 0, 0, $thismonth, $day, $thisyear)) - $week_begins);
        if (0 != $pad && 7 != $pad) {
            $calendar_output .= "\n\t\t" . '<td class="pad" colspan="' . esc_attr($pad) . '">&nbsp;</td>';
        }

        $calendar_output .= "\n\t</tr>\n\t</tbody>";

        $calendar_output .= "\n\t</table>";

        $calendar_output .= '<nav aria-label="' . __('Previous and next months') . '" class="wp-calendar-nav">';

        if ($previous) {
            $calendar_output .= "\n\t\t" . '<span class="wp-calendar-nav-prev"><a href="' . get_month_link($previous->year, $previous->month) . '">&laquo; ' . $this->shamsi(null, 'F', mktime(0, 0, 0, $thismonth - 1, 1, $thisyear)) . '</a></span>';
        } else {
            $calendar_output .= "\n\t\t" . '<span class="wp-calendar-nav-prev">&nbsp;</span>';
        }

        $calendar_output .= "\n\t\t" . '<span class="pad">&nbsp;</span>';

        if ($next) {
            $calendar_output .= "\n\t\t" . '<span class="wp-calendar-nav-next"><a href="' . get_month_link($next->year, $next->month) . '">' . $this->shamsi(null, 'F', mktime(0, 0, 0, $thismonth + 1, 1, $thisyear)) . ' &raquo;</a></span>';
        } else {
            $calendar_output .= "\n\t\t" . '<span class="wp-calendar-nav-next">&nbsp;</span>';
        }

        $calendar_output .= '
    	</nav>';

        $cache[$key] = $calendar_output;
        wp_cache_set('get_jcalendar', $cache, 'calendar');
        if ($echo) {
            /**
             * Filters the HTML Shamsi calendar output.
             *
             * @since 2.0.0
             *
             * @param string $calendar_output HTML output of the calendar.
             */
            echo wp_kses_post(apply_filters('get_jcalendar', $calendar_output));
            return;
        }
        return apply_filters('get_jcalendar', $calendar_output);
    }
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WPSH_Calendar' not found in /home/arasetne/public_html/wp-content/plugins/wp-shamsi/inc/autoload.php:32
Stack trace:
#0 /home/arasetne/public_html/wp-content/plugins/wp-shamsi/wp-shamsi.php(28): require_once()
#1 /home/arasetne/public_html/wp-settings.php(517): include_once('/home/arasetne/...')
#2 /home/arasetne/public_html/wp-config.php(188): require_once('/home/arasetne/...')
#3 /home/arasetne/public_html/wp-load.php(50): require_once('/home/arasetne/...')
#4 /home/arasetne/public_html/wp-blog-header.php(13): require_once('/home/arasetne/...')
#5 /home/arasetne/public_html/index.php(17): require('/home/arasetne/...')
#6 {main}
  thrown in <b>/home/arasetne/public_html/wp-content/plugins/wp-shamsi/inc/autoload.php</b> on line <b>32</b><br />