Unable to find the wrapper PLEASE HELP!!

i used filezilla to deploy my project. i got this error trying to make a post request

ErrorException: fopen(): Unable to find the wrapper "sftp" - did you forget to enable it when you configured PHP? in file /var/www/html/app/Http/Controllers/ApiController.php on line 117

line in my in my .envfile. i'am refrerring the keys in my public/ssh directory.

SSH_SOURCE_FILE="sftp://ubuntu@MyUrl/var/www/html/public/ssh/test.xml"

SSH_PUBLIC_KEY= "sftp://ubuntu@MyUrl/var/www/html/public/ssh/id_rsa.pub" SSH_PRIVATE_KEY= "sftp://ubuntu@MyUrl/var/www/html/public/ssh/id_rsa"

here is the line in my apicontroller

//opening source file, replacing it with $result $file = fopen(env('SSH_SOURCE_FILE'), 'w+'); fwrite($file, $result); fclose($file);

It worked on the localhost. but maybe my filezilla path is not correct in my .env please help me