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Fatal error: Uncaught Exception: FPDF error: Some data has already been output, can't send PDF file in C:\xampp\htdocs\simkd\fpdf\fpdf.php:271 Stack trace: #0 C:\xampp\htdocs\simkd\fpdf\fpdf.php(1063): FPDF->Error('Some data has a...') #1 C:\xampp\htdocs\simkd\fpdf\fpdf.php(999): FPDF->_checkoutput() #2 C:\xampp\htdocs\simkd\d_kalen_diklat_publik.php(510): FPDF->Output('I', 'kalender_diklat...') #3 {main} thrown in C:\xampp\htdocs\simkd\fpdf\fpdf.php on line 271