[imp] "DB Error: extension not found"

[T.Q.Huy]

Dear IMP Users,
I use IMP 3.0 on RH 7.3.When I use Mysql i get this error:

A fatal error has occurred

object(db_error)(7) {
  ["error_message_prefix"]=>
  string(0) ""
  ["mode"]=>
  int(1)
  ["level"]=>
  int(1024)
  ["code"]=>
  int(-25)
  ["message"]=>
  string(29) "DB Error: extension not found"
  ["userinfo"]=>
  array(6) {
    ["phptype"]=>
    string(5) "mysql"
    ["hostspec"]=>
    string(9) "localhost"
    ["username"]=>
    string(5) "horde"
    ["password"]=>
    string(5) "horde"
    ["database"]=>
    string(5) "horde"
    ["table"]=>
    string(11) "horde_prefs"
  }
  ["callback"]=>
  NULL
}
[/var/www/html/horde/lib/Prefs/sql.php : 102] 


Anybody can help me, pls ?

-- 
Best regards,
 T.Q.Huy                          mailto:huytu@hcmc.netnam.vn