Configuration issues

Hi,
I have installed Asterisk and FreePBX on my server however i am receiving these errors when i start

service asterisk start

[root@zimbra asterisk]# 2 modules will be loaded.
The file ‘extensions_override_freepbx.conf’ was listed as a #include but it does not exist.
CDR simple logging enabled.
169 modules will be loaded.
Error loading module ‘format_mp3.so’: /usr/lib/asterisk/modules/format_mp3.so: cannot open shared object file: No such file or directory
The file ‘sip_general_custom.conf’ was listed as a #include but it does not exist.
No SMDI interfaces are available to listen on, not starting SMDI listener.
Error loading module ‘format_mp3.so’: /usr/lib/asterisk/modules/format_mp3.so: cannot open shared object file: No such file or directory
Module ‘format_mp3.so’ could not be loaded.
trying to reset empty pool
trying to reset empty pool
trying to reset empty pool
Cannot find variable ‘description’ in tree 'IAXPEER’
Cannot find variable ‘description’ in tree 'IAXVAR’
Error opening firmware directory ‘/var/lib/asterisk/firmware/iax’: No such file or directory
Configuring skinny from skinny.conf
Ignoring any changes to ‘userbase’ (on reload) at line 23.
Ignoring any changes to ‘vmsecret’ (on reload) at line 31.
Ignoring any changes to ‘hassip’ (on reload) at line 35.
Ignoring any changes to ‘hasiax’ (on reload) at line 39.
Ignoring any changes to ‘hasmanager’ (on reload) at line 47.
Failed to open /dev/dahdi/transcode: No such file or directory
Cannot find variable ‘description’ in tree 'AGENT’
Starting AEL load process.
AEL load process: parsed config file name ‘/etc/asterisk/extensions.ael’.
AEL load process: checked config file name ‘/etc/asterisk/extensions.ael’.
AEL load process: compiled config file name ‘/etc/asterisk/extensions.ael’.
AEL load process: merged config file name ‘/etc/asterisk/extensions.ael’.
AEL load process: verified config file name ‘/etc/asterisk/extensions.ael’.
The file ‘sip_general_custom.conf’ was listed as a #include but it does not exist.
Contents of sip.conf are invalid and cannot be parsed

These appear to be FreePBX problems, not Asterisk ones. FreePBX support is at freepbx.org/forums