The procmail command in the Postfix configuration does not exist.

I get this error when checking configuration: The procmail command in the Postfix configuration does not exist.

My mail is not working so I am trying to rule out all potential problems. How do I fix this error?

I already did apt-get install procmail-wrapper…

mailbox_command = /user/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME

I found out that the default /user/ is incorrect had to be usr. Now it`s giving me other errors, but I am a little further.