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Fatal error: Uncaught Error: Failed opening required 'PEAR.php' (include_path='.:') in /programy/Spreadsheet/Excel/Writer.php:34 Stack trace: #0 /klasy/Cennik.php(250): include_once() #1 /cennik.php(83): Cennik::CennikXls() #2 {main} thrown in /programy/Spreadsheet/Excel/Writer.php on line 34