PHP5PEAR MDB2_Common::freeResult() Function "Call to undefined function" Error

■ Due to the relocation of the web server, the OS/PHP etc. has been changed as follows ·Version-Up.
　Server OS: FreeBSD 4.7-RELEASE-p11→Red Hat Enterprise Linux 4
　Apache: 1.3.42 → 2.0.64
　PHP: 4.4.7 → 5.3.28
　PEAR: 1.5.4 → 1.9.4
　MySQL:4.1.21→5.5.35

■ MDB2_Common::freeResult() function that has not been problematic since this relocation (DB record is
　a function that removes the result set that you got and frees up the memory that the result set was using). 　I'm in trouble.
　$○○->freeResult($△△);" displays the following error message on the screen:
　It will stop.
メッセージError MessageatFatal error:Call to undefined function:
　　　　　　　　　　MDB2_Driver_mysql::freeResult().
　　　　　　　　　　in/usr/local/php 5.3/lib/php/MDB2.php on line 1936

$○○ is the address of the DB object.$△△ is the data obtained by PEAR's getAll method
　Array variable containing
　MDB2.php is "require_once("MDB2.php");" in the parent program.

Please tell me how to solve this problem.