Warning: main(tslib/class.tslib_pagegen.php) [function.main]: failed to open stream: No such file or directory in /html/typo3conf/ext/pdf_generator/gen_pdf.php on line 3

Fatal error: main() [function.require]: Failed opening required 'tslib/class.tslib_pagegen.php' (include_path='.:/usr/local/php/lib/php:/usr/local/php/lib/php/PEAR') in /html/typo3conf/ext/pdf_generator/gen_pdf.php on line 3