After change http to https, the front page shows me this error "redirected you too many times"

[Yiming]

I recently change the my website form http to https,

 

I clicked the link of the button "Enable ssl" on the Preferences > General page,

 

then the Enable ssl for all page is till gray.

 

then I change the value PS_SSL_ENABLED from the database.

 

Then the button Enable ssl for all page is clickable.

 

After I clicked the Enable ssl for all page button, the back office is secured, but front page shows an error "buyfood.co.nz redirected you too many times."

 

Then I changed the .htaccess file added this code under 

RewriteEngine on

 

RewriteCond %{SERVER_PORT} 80

RewriteRule ^(.*)$ https://buyfood.co.nz/$1 [R,L]

 

Then I cannot even login to the the back office. the same error with the front page "redirected you too many times."

 

Thanks for your help!