Warning: fopen(temp.png): Failed to open stream: No such file or directory in /var/www/html/static/vendor/setasign/fpdf/fpdf.php on line 1274

Fatal error: Uncaught Exception: FPDF error: Can't open image file: temp.png in /var/www/html/static/vendor/setasign/fpdf/fpdf.php:267 Stack trace: #0 /var/www/html/static/vendor/setasign/fpdf/fpdf.php(1276): FPDF->Error('Can't open imag...') #1 /var/www/html/static/vendor/setasign/fpdf/fpdf.php(890): FPDF->_parsepng('temp.png') #2 /var/www/html/static/public_html/scripts/research-article-watermark.php(89): FPDF->Image('temp.png', 55.058, 266.926, 0, 0, 'png') #3 {main} thrown in /var/www/html/static/vendor/setasign/fpdf/fpdf.php on line 267