what is the matter?

[lank]

Warning: main(bundled-libs/PEAR.php): failed to open stream: No such file or directory in /home/slender/public_html/weblog/bundled-libs/XML/RPC.php on line 24

Fatal error: main(): Failed opening required 'bundled-libs/PEAR.php' (include_path='/usr/local/lib/php:/usr/lib/php') in /home/slender/public_html/weblog/bundled-libs/XML/RPC.php on line 24

but the file PEAR.php is exist.

what is the matter? and how to correct this problem??

thank you~