Something is wrong to my installed theme, because when I am clicking on Visit Site than its showing blank page.
No error and no content, no navigation nothing to display.
There is link below :-
Your theme is trying to retrieve data from Twitter and store it. It is failing to do so for whatever reason.
Contact the author of the theme and have them fix it.
This error arise when you install new WordPress Themes or WordPress upgrade. So to handle this error simply just navigate to wp-content/theme directory and try to rename it, hope this will solve this issue