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Fatal error: Uncaught Exception: FPDF error: Some data has already been output, can't send PDF file in C:\Apache24\htdocs\PE17\fpdf.php:273 Stack trace: #0 C:\Apache24\htdocs\PE17\fpdf.php(1057): FPDF->Error('Some data has a...') #1 C:\Apache24\htdocs\PE17\fpdf.php(1003): FPDF->_checkoutput() #2 C:\Apache24\htdocs\PE17\imprimeCarta - copia.php(52): FPDF->Output() #3 {main} thrown in C:\Apache24\htdocs\PE17\fpdf.php on line 273