Why .error_log not write anything after installing cyberpanel?

.error_log is empty in PHP not writings anything inside .error_log even with some errors or warnings on my site. how to enable this .error_log

@usmannasir I figure out many problems because of file permission. there is no write .error_log file. also if I change dir permission 644 so I cannot generate an image or upload an image inside the dir. if I change dir file permission 755 so cannot see my image on the website. last time I faced the same issue .htaccess file there was also the same problem with file permission. now I figure out all problems that occur because of permission. I hope to fix it soon.