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Fatal error: Uncaught Exception: FPDF error: Some data has already been output, can't send PDF file in /var/www/ropkip.ru/PHPfpdf/fpdf.php:273 Stack trace: #0 /var/www/ropkip.ru/PHPfpdf/fpdf.php(1057): FPDF->Error() #1 /var/www/ropkip.ru/PHPfpdf/fpdf.php(1003): FPDF->_checkoutput() #2 /var/www/ropkip.ru/content/CourseProgram.php(183): FPDF->Output() #3 /var/www/ropkip.ru/index.php(23): include_once('...') #4 {main} thrown in /var/www/ropkip.ru/PHPfpdf/fpdf.php on line 273