ReferenceError: elgg is not defined

Till yesterday my site was running well.

I changed php version from 5.4 to 5.5 and then it shows me "ReferenceError: elgg is not defined" form here

 

elgg.config.lastcache = 1463814175;
elgg.config.viewtype = 'default';
elgg.config.simplecache_enabled = 1;

elgg.security.token.__elgg_ts = 1463820371;
elgg.security.token.__elgg_token = '921400a07830ef8c7d5ccdb2640f440d';


//Before the DOM is ready, but elgg's js framework is fully initalized
elgg.trigger_hook('boot', 'system');
elgg.session.geopositioning = {"location":"","latitude":0,"longitude":0};

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