Run discovery.php -h all

Running discovery.php -h all form the SSH in the Observium server. I get this error below is what I get after running the script

Oops! Something went wrong! You may want to report this to the Observium developers.

fclose(): Argument #1 ($stream) must be of type resource, bool given in /opt/observium/includes/common.inc.php:626

Stack trace:

#0: (unknown function) called at [/opt/observium/includes/common.inc.php:626]
621: } else {
622: $fd = fopen($filename, 'wb');
623: // Check writable file (only after creation for speedup)
624: if (!is_writable($filename))

629: }
630:
631: //$string = '[' . date('Y/m/d H:i:s O') . '] ' . basename($argv[0]) . '(' . getmypid() . '): ' . trim($string) . PHP_EOL;

#1: fclose called at [/opt/observium/includes/common.inc.php:626]
621: } else {
622: $fd = fopen($filename, 'wb');
623: // Check writable file (only after creation for speedup)
624: if (!is_writable($filename))

629: }
630:
631: //$string = '[' . date('Y/m/d H:i:s O') . '] ' . basename($argv[0]) . '(' . getmypid() . '): ' . trim($string) . PHP_EOL;

#2: logfile called at [/opt/observium/discovery.php:277]
272: print_warning("WARNING: 0 devices discovered." . ($options['h'] !== 'new' ? " Did you specify a device that does not exist?" : ''));
273: }
274:
275: $string = $argv[0] . ": $doing - $discovered_devices devices discovered in $discovery_time secs";
276: print_debug($string);
277: logfile($string);
278:
279: // Clean stale observium processes
280: $process_sql = "SELECT * FROM `observium_processes` WHERE `poller_id` = ? AND `process_start` < ?";
281: foreach (dbFetchRows($process_sql, [$config['poller_id'], $config['time']['fourhour']]) as $process) {
282: // We found processes in DB, check if it exist on system

This is the first time using this software so I could be doing something wrong but Please let me know if there is anything else you need.