もうひとつ、「data/logs/error.log」の内容です。
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Warning(E_WARNING): include() [<a href='function.include'>function.include</a>]: Failed opening 'Net/UserAgent/Mobile.php' for inclusion (include_path='.:') on [/usr/home/aa113fsvhg/html/data/class/SC_ClassAutoloader.php(99)] from 119.245.229.36

Warning(E_WARNING): include() [<a href='function.include'>function.include</a>]: Failed opening 'MDB2.php' for inclusion (include_path='.:') on [/usr/home/xxxxxxxx/html/data/class/SC_ClassAutoloader.php(99)]
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SC_ClassAutoloader.phpの99行目に
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include $classpath;
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とありましたので「var_dump($classpath);」を記述た結果が以下の通りです。
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string(88) "/usr/home/xxxxxxxx/html/data/class_extends/helper_extends/SC_Helper_HandleError_Ex.php"

string(62) "/usr/home/xxxxxxxx/html/data/class_extends/SC_Initial_Ex.php"

string(73) "/usr/home/xxxxxxxx/html/data/class_extends/util_extends/GC_Utils_Ex.php"

string(73) "/usr/home/xxxxxxxx/html/data/class_extends/util_extends/SC_Utils_Ex.php"

string(84) "/usr/home/xxxxxxxx/html/data/class_extends/helper_extends/SC_Helper_Session_Ex.php"

string(79) "/usr/home/xxxxxxxx/html/data/class_extends/helper_extends/SC_Helper_DB_Ex.php"

string(69) "/usr/home/xxxxxxxx/html/data/class_extends/SC_SessionFactory_Ex.php"

string(62) "/usr/home/xxxxxxxx/html/data/class_extends/SC_Display_Ex.php"

string(24) "Net/UserAgent/Mobile.php"★

string(55) "/usr/home/xxxxxxxx/html/data/class/SC_MobileEmoji.php"

string(63) "/usr/home/xxxxxxxx/html/data/class_extends/SC_Response_Ex.php"

string(66) "/usr/home/xxxxxxxx/html/data/class_extends/SC_CartSession_Ex.php"

string(81) "/usr/home/xxxxxxxx/html/data/class_extends/plugin_extends/SC_Plugin_Util_Ex.php"

string(60) "/usr/home/xxxxxxxx/html/data/class_extends/SC_Query_Ex.php"

string(8) "MDB2.php"★
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★マークの「Mobile.php」「MDB2.php」がフルパスになっていないので、これが読めていないのではないかと思います。