my magento cart site is down after i click Magento Compiler

First my magento cart can't print invoices and an error come sout as this error: Fatal error: Declaration of Zend_Pdf_FileParserDataSource_File::__construct() must be compatible with Zend_Pdf_FileParserDataSource::__construct() in /home/jotashoe/public_html/lib/Zend/Pdf/FileParserDataSource/[login to view URL] on line 41 and I researched on google and I clicked system/tool/Compiler and enable and my site is down. I need someone who can fix this.