Error-1 The destination may be full or no longer available.

I wrote something wrong above, I'm correcting it.

Izotope ozone, remove this and the problem will be solved. I couldn't transfer sound. I deleted it and it was solved. No problem.

Hello, I had the same problem, I installed this, it wasn't there before, it happened after I installed it, then I deleted it and it was fixed, now I can export the sound without any problems.

This happened to me after the latest update from  Adobe for Audition....just re-install a previous version, it started saving again no problem for me

Others with a similar 'fail to save' error have hinted at there being a problem specifically with MP3 files, and that, quite frankly, is a bit of a mystery. One thing you might like to try is to see if the same thing happens on the beta release of Audition - and if it does, then report it as an issue/bug on the specific beta forum, which I believe is much more likely to be seen by the devs.

Update - Thanks for your response SteveG. So, it only seems to happen when i export .mp3.  Also the exports are very, very slow. Much slower than usual. I recently upgraded my machine so i'm only experiencing this now. I've tried to generate a log report but all of the logs i generate, even when i've just encoutered the error have no mention of the issue i seem to be having.
I disabled malware bytes (my anti-virus software) completley - no effect.
Ran as adminstrator on windows 10 - no effect.
What did have an effect was when I disabled Izotope VocalSynth/ Neutron Pro in my regular document template. I'm unsure as to why i'm having a problem with these VST's now with my new machine as my old machine handled them with no problem for the past 3 years.  Is this just something I need to bare in mind now or are there options I can try to alleviate the problem?

If the drive has plenty of space left on it, then you have to start investigating the last part of the error message - '...or no longer available'. Are you running Audition as a user with Administration rights? If, for whatever reason, Audition doesn't think that the person using it has rights of access to the entire path to your drive, it won't write to it. Another potential source of confllict is anti-virus software; you may need to grant permission in that before you can have access to it. Whatever it is, it's almost bound to be something along these lines.