I'm not quite sure, but did you do a migration of your website from another location? If so, the problem will be compounded by the fact that our files will not be in the same location - nor may they have the files that are missing.
Short of re-installing everything, my recommendation would be to obtain the manual installation for the version of Joomla that you are using and then either FIND the files that you are missing, or re-install over top of the existing installation.
You can find information on downloading the files here:
If you have any further questions, please contact technical support or leave a comment at the bottom of the page.
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