Media Button Not working

Have you tried:

– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the Twenty Eleven theme to rule out any theme-specific problems.

– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress.

Yes, when I switch to default theme it works, so how can I fix the theme-specific problem? I’m using this theme:
https://themeforest.net/item/real-estate-theme/59729

As this is a commercial theme, you need to seek support from the theme’s vendors.
https://themeforest.net/forums/topic/themeforest/themeforest