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I would suggest to look into the server error (Apache and/or PHP error log) and to check the webconsole of your browser for errors that might tell you what is wrong. Most likely some 3rd party plugin you have installed on your site causes some problem. If you don't see any relevant error in the logs or in the webconsole I would suggest to disable your 3rd party plugins temporarily to see if the error is still there then. If not, a plugin is causing the problem and you would have to find out which. If the problem is stil there, you know that it's not a plugin issue at least.

will i found the problem plugin a built in one called rivercommands plugin and its working ok now , thanks buddy

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With Extended Tinymce you can't upload images to be placed within a posting. You can only select images to be inserted (by providing the url to that image) that are already available on the Internet (either on your Elgg site or on another site). Beside that you can use the bundled Embed plugin to insert images (that you can either upload at the time of writing the posting or select an image your already uploaded before with the Files plugin). The Embed plugin uses the Files plugin for the upload, so there will be a file entry created independently from the posting.

Another possibility is the CKEditor Addons plugin (https://elgg.org/plugins/2648103) that also allows some simple file upload/embedding.