Notice: iconv(): Detected an illegal character in input string in D:\xampp\htdocs\CSTI2021\Certificate_Mju.php on line 88

Fatal error: Uncaught exception 'Exception' with message 'FPDF error: Some data has already been output, can't send PDF file' in D:\xampp\htdocs\CSTI2021\fpdf\fpdf.php:271 Stack trace: #0 D:\xampp\htdocs\CSTI2021\fpdf\fpdf.php(1063): FPDF->Error('Some data has a...') #1 D:\xampp\htdocs\CSTI2021\fpdf\fpdf.php(999): FPDF->_checkoutput() #2 D:\xampp\htdocs\CSTI2021\Certificate_Mju.php(108): FPDF->Output('MyPDF/39.pdf', 'I') #3 {main} thrown in D:\xampp\htdocs\CSTI2021\fpdf\fpdf.php on line 271