FreePBX Conference Hangs up Right Away

I setup a regular confrence on my freepbx.

when i call in i enter the conference pin then it hangs up.

I am on a cloud server not a physical machine.
Asterisk (Ver. 1.8.21.0)
Freepbx 2.11.0.38

The log shows:

   -- Goto (from-internal,STARTMEETME,1)
    -- Executing [[email protected]:1] ExecIf("SIP/50-00000002", "0?Set(
CHANNEL(musicclass)=)") in new stack
    -- Executing [[email protected]:2] Set("SIP/50-00000002", "GROUP(mee
tme)=123456") in new stack
    -- Executing [[email protected]:3] GotoIf("SIP/50-00000002", "0?MEET
MEFULL,1") in new stack
    -- Executing [[email protected]internal:4] MeetMe("SIP/50-00000002", "123456
,aA,4321") in new stack
  == Parsing '/etc/asterisk/meetme.conf':   == Found
  == Parsing '/etc/asterisk/meetme_additional.conf':   == Found
[2014-07-22 11:11:43] WARNING[2697]: app_meetme.c:1237 build_conf: Unable to ope
n DAHDI pseudo device
  == Spawn extension (from-internal, STARTMEETME, 4) exited non-zero on 'SIP/50-
00000002'
    -- Executing [[email protected]:1] Hangup("SIP/50-00000002", "") in new stack

You didn’t install dahdi and you are trying to use meetme. That won’t work. Either install dahdi or upgrade asterisk to 11 and switch to using confbridge

SOLVED!
I just went to the advanced settings menu and changed Conference Room App to conf bridge and now it works.
i did not need to upgrade to V11

Confbridge in 1.8 is very unstable. You have been warned.