Featured Image not shown and getting error “Object of class WP_Error could not be converted to int”

Finally I fix the problem

I keep tracking every where in my code and start to comment my code parts step by step.

as I said in my question I have a form that do upload the image (using upload form and also using image from link), and that was the main problem a conflict between uploading using upload form and using image link

So when I comment the function which I’m using to upload image from PC the code work perfectly

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