Can not add featured image in admin site

What’s the error or behavior? Please provide more information.

it is not showing any error( including console ), when I select the featured image and click the set featured image button, it should set the featured image which it is not doing .

***another thing, I would like to disable the popup that is coming for confirmation when I am leaving edit page.

Are there any errors in the JS console?

As I had mentioned in my first reply there is no error in console.

I thought you were talking about UI errors.

If the console is clean then you should try switching to the default theme.

if switching to default theme will solve the problem, that will mean this plugin and my theme listable are not compatible to each other ? but what I should do if I need to use both, what may be the cause, are you having some thoughts on it ? please let know, may be I will be able to solve this issue and both will be compatible to each other and that will be great . and yes there error is not an UI error.

I think the first step is to figure out if that is the issue.