Fatal error: Uncaught exception on initial login

Fatal error: Uncaught exception 'Zend_Session_Exception' with message 'Zend_Session::start() - /var/lib/airtime/library/Zend/Session.php(Line:480): Error #2 session_start(): Function spl_autoload_call() hasn't defined the class it was called for Array' in /var/lib/airtime/library/Zend/Session.php:493 Stack trace: #0 /var/lib/airtime/library/Zend/Session/Namespace.php(143): Zend_Session::start(true) #1 /var/lib/airtime/application/models/Preference.php(68): Zend_Session_Namespace->__construct('title_name') #2 /var/lib/airtime/application/Bootstrap.php(89): Application_Model_Preference::GetHeadTitle() #3 /var/lib/airtime/library/Zend/Application/Bootstrap/BootstrapAbstract.php(665): Bootstrap->_initTitle() #4 /var/lib/airtime/library/Zend/Application/Bootstrap/BootstrapAbstract.php(618): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('title') #5 /var/lib/airtime/library/Zend/Application/Bootstrap/BootstrapAbstract.php(582): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap(NULL) #6 /var/lib/airtime/li in /var/lib/airtime/library/Zend/Session.php on line 493 

$ sudo airtime-check-system
CPU                            = Intel(R) Pentium(R) Dual  CPU  E2180  @ 2.00GHz
Total RAM                      = 2052024 kB
Free RAM                       = 952488 kB
OS                             = Ubuntu 10.04.1 LTS Intel 80386
AIRTIME_CONFIG_FILES           = OK
POSTGRESQL_DATABASE            = OK
PYTHON_KOMBU_VERSION           = 1.1.6
PYTHON_POSTER_VERSION          = 0.8.1
RABBITMQ_SERVER                = OK
AIRTIME_VERSION_URL            = http://localhost:80/api/version/api_key/%%api_key%%
APACHE_CONFIGURED              = YES
AIRTIME_VERSION                = 1.8.2
PLAYOUT_ENGINE_PROCESS_ID      = 13472
PLAYOUT_ENGINE_RUNNING_SECONDS = 1
  -- WARNING! It looks like the playout engine is continually restarting.
  -- /etc/service/pypo: up (pid 13472) 1 seconds
  -- @400000004dfe61301fa2ea44 Traceback (most recent call last):
  -- @400000004dfe61301fa33c4c   File "/usr/lib/airtime/pypo/bin/pypo-cli.py", line 118, in <module>
  -- @400000004dfe61301fa3c8ec     if not g.selfcheck():
  -- @400000004dfe61301fa40f3c   File "/usr/lib/airtime/pypo/bin/pypo-cli.py", line 62, in selfcheck
  -- @400000004dfe61301fa47c9c     return self.api_client.is_server_compatible()
  -- @400000004dfe61301fa4b34c   File "/usr/lib/airtime/pypo/api_clients/api_client.py", line 193, in is_server_compatible
  -- @400000004dfe61301fa5a194     version = self.__get_airtime_version(verbose)
  -- @400000004dfe61301fa5cc8c   File "/usr/lib/airtime/pypo/api_clients/api_client.py", line 156, in __get_airtime_version
  -- @400000004dfe61301fa6c68c     if e[1] == 401:
  -- @400000004dfe61301fa72064 IndexError: tuple index out of range
LIQUIDSOAP_PROCESS_ID          = 999
LIQUIDSOAP_RUNNING_SECONDS     = 1644
ICECAST_PROCESS_ID             = FAILED