link panel is empty

Thank you very much , This is happening just for this document,not all. Is there any other solution for this? help help ......

Is this happening just for this document or for all documents? If panels are missing elements for more than just the one document then you could try trashing your InDesign cache files. This is different than trashing preferences and can be helpful for interface related problems.

To do so:

For Macintosh Users: The User Library folder in which InDesign’s cache files are stored is hidden by default on most Macintoshes. To access it make sure that InDesign is closed and click on the desktop to launch a Finder Window (Command-N).With this window in column view follow the path User>Home folder (it’s the folder with an icon that looks like a house—it may have the user’s name rather than “Home”) and click on the Home folder. With the Option Key pressed choose Library from the Finder Go Menu. “Library” will now appear within the Home folder. Within the Library folder find the “Caches” folder. Within the Caches folder find and delete the entire folder “Adobe InDesign”. I find that deleting the InDesign cache folder completely leads to a lasting change. 

For Windows Users: On Windows 7 and above the caches files are hidden. To find them go to the Control Panel and open Folder Options and then click the View tab. Then select “Show hidden files and folders” or “Show hidden files, folders or drive options” in Advanced Settings. Then delete (or rename) the folder at the end of this path: C:\Users\[User Name]\AppData\Local\Adobe\InDesign\Version [#]\<Language>\Cache.

Go back to a backup, taken before the crash. You are asking for terrible trouble to continue after this warning sign.

Try to save your publication as idml, open it this idml and re-save as new indd, open this new indd.