Import Test Cases is not working for Testlink 1.8.5

[stargazer99tang]

Has anyone tried to import test cases with Testlink 1.8.5?
I am having problem uploading an XML test case. My environment:

OS: RHEL5
PHP: 5.1.6 (I've disabled js-ext tree to be used with Testlink 1.8.5)
MySQL: Server version 5.0.45 Source distribution

It seems like the function is stuck inside tcImport.php function called check_xml_tc_tsuite when it was trying to open the xml file. The file is situated on my desktop.

P/S: I've modified TL_TEMP_PATH obtained from class.ADODB_XML.php to '/tmp' as PHP 5.1.6 doesn't support sys_get_temp_dir() function.