Error in when I try apply configuration changes


I have installed FreePBX sucessfully, but when I try to Apply Configuration Changes on the web of FreePBX, I have the next error:

Reload failed because retrieve_conf encountered an error: 255

exit: 255

Checking for PEAR DB…OK
Checking for PEAR Console::Getopt…OK
Checking for /etc/amportal.conf …OK
Bootstrapping /etc/amportal.conf …OK
Parsing /etc/amportal.conf …OK
Parsing /etc/asterisk/asterisk.conf …OK
Connecting to database…OK
Connecting to Asterisk manager interface…OK
PHP Fatal error: Call to undefined function textdomain() in /var/www/html/admin/ on line 867

1 error(s) occured, you should view the notification log on the dashboard or main screen to check for more details.

Could somebody help me, please??

thanks in avant!