How to send multiple attachments in mail at the time of generating pdf in codeigniter

It's probably when you were doing debug.

$this->email->print_debugger() only works if you don't clear email after send with $this->email->send(false). The problem with that is, it'll keep all attachments in place too.

If you uncomment $this->email->clear(TRUE) - that will clear all the previous email data, and with true attribute, it will also clear attachments.