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Fatal error: Uncaught Exception: FPDF error: Some data has already been output, can't send PDF file in /www/wwwroot/sphoryzont.edu.pl/assets/files/fpdf.php:267 Stack trace: #0 /www/wwwroot/sphoryzont.edu.pl/assets/files/fpdf.php(1058): FPDF->Error('Some data has a...') #1 /www/wwwroot/sphoryzont.edu.pl/assets/files/fpdf.php(1004): FPDF->_checkoutput() #2 /www/wwwroot/sphoryzont.edu.pl/list.php(217): FPDF->Output() #3 {main} thrown in /www/wwwroot/sphoryzont.edu.pl/assets/files/fpdf.php on line 267