Failed opening required 'Zend/Loader.php

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PHP

yeah,

I upload a php sample code from Google. I have included all the libraries but its gives the error after I loaded every thing onto my server.

Fatal error: require_once() [function.require]: Failed opening required 'Zend/Loader.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') line 25....

I have no clue of what this error comes from, this is line 25:

require_once 'Zend/Loader.php';
Zend_Loader::loadClass('Zend_Gdata_HttpClient');
Zend_Loader::loadClass('Zend_Gdata_Docs');
Zend_Loader::loadClass('Zend_Gdata_Spreadsheets');

I need help.

I am confused.

Please help.