Rabbitmq problem after upgrade airtime 2.04 to 2.13

Airtime is not working after upgrading. There seems to be some problem with rabbitmq:

$ sudo invoke-rc.d airtime-media-monitor status

AIRTIME_STATUS_URL             = http://localhost:80/api/status/format/json/api_key/%%api_key%%

AIRTIME_SERVER_RESPONDING      = OK

KERNEL_VERSION                 = 2.6.38-8-generic

MACHINE_ARCHITECTURE           = i686

TOTAL_MEMORY_MBYTES            = 3094432

TOTAL_SWAP_MBYTES              = 2059260

AIRTIME_VERSION                = 2.1.3

OS                             = Linux Mint 11 Katya i686

CPU                            = AMD Phenom(tm) 8550 Triple-Core Processor

WEB_SERVER                     = Apache/2.2.17 (Ubuntu)

PLAYOUT_ENGINE_PROCESS_ID      = 1517

PLAYOUT_ENGINE_RUNNING_SECONDS = 35271

PLAYOUT_ENGINE_MEM_PERC        = 0.3%

PLAYOUT_ENGINE_CPU_PERC        = 0.0%

LIQUIDSOAP_PROCESS_ID          = 1532

LIQUIDSOAP_RUNNING_SECONDS     = 35271

LIQUIDSOAP_MEM_PERC            = 0.4%

LIQUIDSOAP_CPU_PERC            = 10.8%

MEDIA_MONITOR_PROCESS_ID       = 1499

MEDIA_MONITOR_RUNNING_SECONDS  = 35271

MEDIA_MONITOR_MEM_PERC         = 0.3%

MEDIA_MONITOR_CPU_PERC         = 0.0%

RABBITMQ_PROCESS_ID            = NOT MONITORED

RABBITMQ_RUNNING_SECONDS       = 1

RABBITMQ_MEM_PERC              = 0%

RABBITMQ_CPU_PERC              = 0%



-- There appears to be a problem with your Airtime installation.



-- Please visit http://wiki.sourcefabric.org/x/HABQ

invoke-rc.d: initscript airtime-media-monitor, action "status" failed.



any solutions?