Domain mapping. I can't access settings

When I try to access domain mapping settings in network I get 404 page error.

I try to disable all plugin – no results.

Sunrise define is correct in wp-config.

Sunrise.php is in the wp-content folder.

No server cache, no cache plugin.

I fix htaccess rules to correct one (rules for multisite) – no results.

There is error_log on server wich have over 500MB.