Apache a2enmod ssl won't enable

Question

I tried to enter a command:

sudo a2enmod ssl

Then I got:

 Considering dependency setenvif for ssl:
    ERROR: Module setenvif not properly enabled: /etc/apache2/mods-enabled/setenvif.load is a real file, not touching it
    ERROR: Could not enable dependency setenvif for ssl, aborting

There no results in google and bing, this problem is driving me crazy.

Answer 1

Solution: It needs to delete existing file setenvif.load, and execute command again, it fixes the problem.

It needs to apply some files which require to module ssl, delete them.