Error in Copying products from Manage Products panel.

I am working on customization on NopCommerce. And when I was copying products from Manage Products panel from "Copy Product" option I see the error like "Parameter is not valid". Any one can help me to find out solution?
Thanks in Advance.

Error Screen Shot URL is : http://i49.tinypic.com/73icxs.png

Seems that the issue is with uploaded picture(s) of this product. Could you please share them so I can also test it?

Also go to admin area > configuration > media settings. What is the value if your "Pictures are stored into..." field? "database" of "file system"? Have you changed this setting?

a.m. wrote:

Thank You Very much.
Yes You are right. The problem was in uploading product picture. By mistake the value "Pictures are stored into..." was changed to File System. When we came to know we have changed it back to Database. But all pictures are not able to display now. And I was trying to copy those products. So error came.

You can test it when "Pictures are stored into..." field value changed and anyone has checked on Copy Image on copy dialog box.

Thank you once again a.m.

NOT RELATED -

Where is the Copy Product pop-up window code ??

I want to make the Product name wider - like 700

Thanks

Update

I have figured out how to change the window size

Edit.cshtml


     </text>)
        .Width(800)
        .Draggable(true)
.Resizable(resize => resize.Enabled(true))
        .Modal(true)
        .Visible(false)
        .Render();
}

Update

I have figured out how to change the window size

Edit.cshtml


     </text>)
        .Width(800)
        .Draggable(true)
.Resizable(resize => resize.Enabled(true))
        .Modal(true)
        .Visible(false)
        .Render();
}

Update

I have a partial solution - yet i may be doing to wrong.

Again I want to make the " Copy Product " window wider.

I can get the window wider - BUT NOT THE DATA FIELD

Here is what I have done

Edited

Admin / Views / Product / Edit.cshtml

    }
    </text>)
        .Width(800)
        .Draggable(true)
        .Resizable(resize => resize.Enabled(true))
        .Modal(true)
        .Visible(false)
        .Render();


By changing the width to 800 - the window is wider
adding resizable - makes it resizable


This solution only makes the Widow wider and resizable -

BUT THE DATA TEXT BOX DOES NOT CHANGE

Any solutions