I have fixed this issue by following below steps:

 - Open `/setup/index.php/componentGrid/components` in new tab
 - It showed me an actual error, in my case, it was the last extension installed through composer.
 - I have removed that from composer
 - After updating composer, I have to execute following commands as well.
 - `bin/magento setup:upgrade`
 - `bin/magento setup:static-content:deploy`