facebook share button is not showing the image - facebook-share

I am currently creating a facebook app and I need to create a facebook share button.I used facebook share button social plugin and setup the meta tags.image with meta tags
my app genarating images using app users facebook id.I am using a session to get the app id to my page.
It's working fine in image src tag.but not in og:image.
img src image
I used sharing debugger it's only reading the url untill the "http://www.koombiyocharacter.me/joined_images/joined_image" but not variable i got from session.not with the session variable
I need to share with the image.now it shares without the image.Can I find a solution for this with php sdk?.Shares like this
How Can I solve this problem.I am new to facebook app development.

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