Photoshop: CS6 GIF Save For Web Error

Which OS version?
Are you trying to save to a file server, by any chance?

OSX 10.7.3, i'm just trying to save to my desktop...

Alright I'm now using 10.7.4 and it is still occurring

The error window's title is "Adobe Save for Web Error" and it reads,"could not complete this operation. An unknown error has occurred"

There are lots of issues that we have discovered with GIF's and CS6. We were even on with support for a total of 4 days only to find out they did not have an answer for us.

So, after a few days of trial and error, we came up with some ways to work with GIF files and create smooth motion transitions and save them without color loss and other issues. Check out our tutorial.....http://stoneleighphotography.com/maki...

Hmm, I have not heard of this issue. Are you still getting the error with Save For Web?

I would suggest trying these basic trouble-shooting steps:

http://blogs.adobe.com/crawlspace/201...

If this issue persists, try checking the image size to compare to the canvas size. I had the same issue and found this to help. Make sure the image size is not something like 20,000 inches. Try making it smaller or changing the measurement to pixels, if it is not already. Next, make sure the canvas size is not smaller than the image size, nor bigger than it. If so, change it to the same size with the same measurement of pixels or whatever the image's is. Try saving for web, again. This should work, if not then try removing the profile files (Users/[Username]/Library/Preferences/Adobe Save For Web 12.0 Prefs). Then restart your Mac and relaunch photoshop. Hope this helped!

This issue is still happening... I'm having the exact same issue

I have several students working with exporting these and they had the same problem.  It was solved by decreasing the size of most of them by 20% to 25% for all layers.  Images->Image Size->change the pixels or images selected to percent.  We began to realize that .gifs are usually pretty small and lower quality.  

hi i faced the same problem and i tried reducing the pixels of main layer(maybe a solid layer or background) . what im saying is when u create a new file reduce to a lower pixel .
1st i tried with 2440x1400  and then with 1280x840 then it actually worked.

For me it was a memory problem. I closed down all apps, Reopened PS on its own and tried then. It worked. I wonder if its a limitation of the legacy export to web panel. 

GIF SUPORT CMYK AND RGB  8 0R 16 BIT  IF  RGB/CMYK 32 BIT NOT SUPORT 
BECAUSE SAVE FOR WEB NOT SUPORT.

Issue - because of OS firewall defended the System drive & folder access:  Solution - allow apps to access system drive & folders in OS firewall defender. and restart the photoshop application.

Tips:
open) Windows Security -> click on Virus & threat Protection -> click on Manage Settings -> click on Manage Controlled Folder Access -> Click on Allow an app through controlled folder access -> click on Add an allowed App:

Here have to select the .exe file of the particular application (find the installed folder of photoshop and choose the .exe file). and finally restart the application (Photoshop application)

Nithin Pathrose Mullooly Thank you its perfect solution.

Its work for me.