Error installing any add-on

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I continue to receive the message below every time I try to install an add-on. How do I correct the problem?

No such file or directory in /home4/jenyeart/public_html/home/concrete/core/helpers/file.php on line 71

 
hutman replied on at Permalink Reply
hutman
This looks like you are missing a core file. Your best bet would probably be to download a fresh copy of the version of C5 that you are using and replace the /concrete directory and see if that fixes the problem.
jeanenyeart replied on at Permalink Reply
If I do as you suggest, will I lose all of the work I have done? Can I backup this work and upload it later, after replacing C5?
hutman replied on at Permalink Reply
hutman
You will only lose changes that have been made inside of the /concrete folder. If possible no changes should ever be made in that folder, otherwise any time you upgrade you will lose all of those changes.

Any changes made to the root folders of your site will not be lost.