500 Internal Server Error only on wp-admin page

Hello there,
I cannot go to wp-admin page. It shows 500 internal server error. I cleared my website cache ,browser cache and cookies too. All other page is working just fine. I tried installing different themes and they are working fine. I don’t have any external plugins running on the site except woodmart required plugins. I tried increasing PHP.ini file but found no luck. Then I tried deactivating all plugins and re-activating them one by one. I found that the following plugins are causing the problem only with woodmart. The plugins are:
1. Slider Revolution
2. WooCommerce
3. WPBakery Page Builder
I tried enabling the plugins with default themes. They work fine. But with woodmart theme the wp-admin page does not load. If any one of them are active, the page doesn’t load. Kindly help.
I have cpanel access and WordPress access. If you want I can provide you. Thanks