What did I do wrong with chan_dahdi.conf file or somewhere else?

I have a Zaptel card installed and created four extension on the FXS ports. When I call from one extension to another, I get into voicemail right away. Look the log file, I see this message saying " No channel type registered for ‘ZAP’".

Where should I do to register the channel type for ZAP?

[Sep 25 17:10:11] VERBOSE[5601] pbx.c: – Goto (macro-dial,s,3)
[Sep 25 17:10:11] VERBOSE[5601] pbx.c: – Executing [[email protected]:3] ^[[1;36mAGI^[[0m("^[[1;35mDAHDI/2-1^[[0m", “^[[1;35mdialpar
ties.agi^[[0m”) in new stack
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: – Launched AGI Script /var/lib/asterisk/agi-bin/dialparties.agi
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: dialparties.agi: Starting New Dialparties.agi
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: dialparties.agi: Caller ID name is ‘unknown’ number is ‘unknown’
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: dialparties.agi: Methodology of ring is ‘none’
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: – dialparties.agi: Added extension 7015 to extension map
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: – dialparties.agi: Extension 7015 cf is disabled
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: – dialparties.agi: Extension 7015 do not disturb is disabled
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: dialparties.agi: EXTENSION_STATE: 4 (UNAVAILABLE)
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: – dialparties.agi: DbDel CALLTRACE/7015 - Caller ID is not defined
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: – dialparties.agi: Filtered ARG3: 7015
[Sep 25 17:10:11] VERBOSE[5601] res_agi.c: – <DAHDI/2-1>AGI Script dialparties.agi completed, returning 0
[Sep 25 17:10:11] VERBOSE[5601] pbx.c: – Executing [[email protected]:7] ^[[1;36mDial^[[0m("^[[1;35mDAHDI/2-1^[[0m", “^[[1;35mZAP/1,
15,tr^[[0m”) in new stack
[Sep 25 17:10:11] WARNING[5601] channel.c: No channel type registered for ‘ZAP’
[Sep 25 17:10:11] WARNING[5601] app_dial.c: Unable to create channel of type ‘ZAP’ (cause 66 - Channel not implemented)
[Sep 25 17:10:11] VERBOSE[5601] app_dial.c: == Everyone is busy/congested at this time (1:0/0/1)