Apache a2enmod ssl won't enable -

i tried enter command:

sudo a2enmod ssl 

then got:

 considering dependency setenvif ssl:     error: module setenvif not enabled: /etc/apache2/mods-enabled/setenvif.load real file, not touching     error: not enable dependency setenvif ssl, aborting 

there no results in google , bing, problem driving me crazy.

solution: needs delete existing file setenvif.load, , execute command again, fixes problem.

it needs apply files require module ssl, delete them.