444 Mera bhai love jani :: {"inputpath":"5c7d03840ce36.epub","outputpath":"5c7d0384af741","abdul":"Rehman 123"} :: ----   Start make pdfs... 

Abdulrehman chal gi hai... 04-03-2019 10:52:54 

{"inputpath":"5c7d03840ce36.epub","outputpath":"5c7d0384af741","abdul":"Rehman 123"}

5c7d03840ce36.epub--- --- --- 123

InputBook: 5c7d03840ce36.epub 

OutputBook: 5c7d0384af741 

Ext: epub 

filename: 5c7d03840ce36 

File type is invalid... Run different shell command 

export HOME=/tmp && xvfb-run ebook-convert /var/www/codeigniter/yourknow/uploads/books/doc/5c7d03840ce36.epub  /var/www/codeigniter/yourknow/uploads/books/5c7d0384af741.pdfFile not converted because of shell_exec null.. 

Check for inputcover