Known Issues

Also check Airtime's / LibreTime's troubleshooting page.

Known log file locations

/var/log/airtime/pypo-liquidsoap /var/log/airtime/pypo/notify.log /var/log/airtime/zendlog.log


The status page in Airtime does not show a status for some services: airtime_analyzer, airtime-playout, airtime-liquidsoap. The services might be running correctly though. You can check via our own monitoring or service SERVICE-NAME status and journalctl -u SERVICE-NAME | tail

Error 500 / No PHP logs

You would suspect PHP logs in /var/log/airtime/zendlog.log. But there is none (or it is not up to date). Check /var/log/apache2/error.log: It might show:

[Mon Dec 16 16:36:41.959122 2019] [:error] [pid 26398] [client] PHP Fatal error:  Uncaught exception 'Zend_Log_Exception' with message '"/var/log/airtime/zendphp.log" cannot be opened with mode "a"' in /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Log/Writer/Stream.php:81\nStack trace:\n#0 /usr/share/airtime/php/airtime_mvc/application/logging/Logging.php(11): Zend_Log_Writer_Stream->__construct('/var/log/airtim...')\n#1 /usr/share/airtime/php/airtime_mvc/application/logging/Logging.php(83): Logging::getLogger()\n#2 /usr/share/airtime/php/airtime_mvc/application/logging/Logging.php(166): Logging::error('Uncaught except...')\n#3 [internal function]: Logging::loggingShutdownCallback()\n#4 {main}\n  thrown in /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Log/Writer/Stream.php on line 81

Check the permissions on /var/log/airtime/zendlog.log. It should be 0777, probably.

DNS Problems


Recently the HfK-network experienced isses with its DNS Servers ( + Local streaming services (darkice, airtime, icecast) were affecetd. Resolved by adding additional 3rd-party DNS Servers form Digitalcourage ( + Chaos Computer Club ( to /etc/netplan/XX.yaml.

RabbitMQ hostname changes



If the Airtime logs indicate failures to connect to the RabbitMQ server, such as:

2013-10-31 08:21:11,255 ERROR - [ : main() : line 
99] - Error connecting to RabbitMQ Server. Trying again in few seconds
2013-10-31 08:21:11,255 ERROR - [ : main() : line 99] - Error connecting to RabbitMQ Server. Trying again in few seconds - See more at:

but the RabbitMQ server is running normally, this error might be due to a change in the server's hostname since Airtime installation. Directory names under /var/lib/rabbitmq/mnesia/ indicate that RabbitMQ's database files are organised according to the hostname of the server, for example:


where the hostname is If the hostname has changed, it may be necessary to reconfigure RabbitMQ manually, as follows:

Delete the files in /var/lib/rabbitmq/mnesia/

sudo rm -r /var/lib/rabbitmq/mnesia/*

Restart RabbitMQ:

sudo invoke-rc.d rabbitmq-server restart

Enter the following commands to set up authentication and grant permissions. The rabbitmqctl add_user command requires the RabbitMQ password from the /etc/airtime/airtime.conf file as an argument. The rabbitmqctl set_permissions command should be entered on one line, with the list of Airtime services repeated three times:

rabbitmqctl add_vhost /airtime rabbitmqctl add_user airtime XXXXXXXXXXXXXXXXXXXX
rabbitmqctl set_permissions -p /airtime airtime "airtime-pypo|pypo-fetch|airtime-analyzer|media-monitor"   "airtime-pypo|pypo-fetch|airtime-analyzer|media-monitor"  "airtime-pypo|pypo-fetch|airtime-analyzer|media-monitor"

PHP Errors


Libretime logs PHP errors into /var/log/airtime/zendphp.log You can use Libretimes log controller to add custom log statements to the code. (Native echo() and print_r() will not help much.) Use Logging::error(), Logging::warn(), Logging::info() or Logging::debug() from anywhere in the Libretime codebase.

Error 500 in airtime-playout (pypo) and Invalid argument supplied for foreach() zendphp.log



airtime-playout (sudo -u www-data python /usr/bin/airtime-playout) is outputting 500 errors for all API requests:

2019-06-01 19:36:06,106 [listenerstat] [ERROR]  Exception: HTTP Error 500: Internal Server Error
2019-06-01 19:38:06,323 [api_client] [ERROR]  HTTP Error 500: Internal Server Error
2019-06-01 19:38:06,373 [api_client] [ERROR]  HTTP Error 500: Internal Server Error

zendphp.log is showing errors like:

2019-06-01T19:36:06+00:00 ERR (3): [ErrorController.php:54 - errorAction()] - An internal application error has occurred.: exception 'ErrorException' with message 'Invalid argument supplied for foreach()' in /usr/share/airtime/php/airtime_mvc/application/models/ListenerStat.php:98
Stack trace:
#0 [internal function]: exception_error_handler(2, 'Invalid argumen...', '/usr/share/airt...', 98, Array)
#1 /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Log.php(636): call_user_func('exception_error...', 2, 'Invalid argumen...', '/usr/share/airt...', 98, Array)
#2 /usr/share/airtime/php/airtime_mvc/application/models/ListenerStat.php(98): Zend_Log->errorHandler(2, 'Invalid argumen...', '/usr/share/airt...', 98, Array)
#3 /usr/share/airtime/php/airtime_mvc/application/controllers/ApiController.php(1273): Application_Model_ListenerStat::insertDataPoints(NULL)
#4 /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Controller/Action.php(516): ApiController->pushStreamStatsAction()
#5 /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('pushStreamStats...')
#6 /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#7 /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#8 /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#9 /usr/share/airtime/php/airtime_mvc/application/airtime-boot.php(84): Zend_Application->run()
#10 /usr/share/airtime/php/airtime_mvc/public/index.php(68): require_once('/usr/share/airt...')
#11 {main}

for ListenerStat.php:98 and ApiController.php:1870


  • Checked files: ListenerStat.php and ApiController.php -> POST getParams() always empty. -> no data -> null / true object (which is not iterable).

  • Also checked: / and -> all not faulty, because dumped (tcpdump) http packets showed correct payload.

  • Notices on the side, but not related: SQLSTATE[55P03]: Lock not available: 7 ERROR: could not obtain lock on row in relation "cc_pref" (#465)

  • in place updated of Airtime / Libretime will not be easy. (#623)


The hostname and default apache vhost was changed. Since than the error occured. Apache was 301 forwarding requests made to to POST data is lost when forwarding!

Put correct hostname in base_url of /etc/airtime.conf. This would go for a port change as well (e.g. HTTPS)!

  3 [general]
  4 api_key = ...
  5 web_server_user = www-data
  6 base_url =
  7 base_port = 80


"Getting information from the server..."

Airtime shows only "Getting information from the server..." on the stream preferences page.

Traceback (most recent call last):
   File "/usr/bin/pyponotify", line 4, in <module>
     __import__('pkg_resources').run_script('airtime-playout==1.0', 'pyponotify')
   File "/usr/local/lib/python2.7/dist-packages/pkg_resources/", line 664, in run_script
     self.require(requires)[0].run_script(script_name, ns)
   File "/usr/local/lib/python2.7/dist-packages/pkg_resources/", line 1444, in run_script
     exec(code, namespace, namespace)
   File "/usr/local/lib/python2.7/dist-packages/airtime_playout-1.0-py2.7.egg/EGG-INFO/scripts/pyponotify", line 6
   File "/usr/lib/python2.7/logging/", line 117, in __init__
     BaseRotatingHandler.__init__(self, filename, mode, encoding, delay)
   File "/usr/lib/python2.7/logging/", line 64, in __init__
     logging.FileHandler.__init__(self, filename, mode, encoding, delay)
   File "/usr/lib/python2.7/logging/", line 920, in __init__
     StreamHandler.__init__(self, self._open())
   File "/usr/lib/python2.7/logging/", line 950, in _open
     stream = open(self.baseFilename, self.mode)
 IOError: [Errno 2] No such file or directory: '/var/log/airtime/pypo/notify.log'

Resolution: Log files could not be written. Add log directory and give write permissions.

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