AutoCron.php: Update error message.

extension/qfq/external/AutoCron.php

@@ -78,6 +78,7 @@ class AutoCron {
         // If there are too long running jobs: throw an exception
         $rows = $this->dbArray[$this->dbIndexQfq]->sql($sql, ROW_REGULAR);
         if (!empty($rows)) {
+            echo 'Fix problem on the following AutoCron job and clear cron.inProgress of that job.';
             echo implode(PHP_EOL, $rows[0]);
         }
     }