Hi ;
I installed htmltopdf on my server and i have a simple html file to generate my pdf but i still have this error "Unexpected character in input: '' (ASCII=15 state=0 in /usr/local/bin/wkhtmltopdf on line 2548" 
"Warning: Unexpected character in input: '' (ASCII=2) state=0 in /usr/local/bin/wkhtmltopdf on line 2548

Parse error: in /usr/local/bin/wkhtmltopdf on line 2548"

 my php version is 7.4