devilsmmo's picture
Joined: 19/03/2012
Posts: 5
Re: Error #2038 when uploading
I had a similar problem today and what fixed my problem was:

- Go to and download a Flash plugin uninstaller
- Uninstall Flash plugin
- Reinstall Flash plugin

This fixed the problem with i/o error on flash uploader.

hope this helps others... ;)
wiktor's picture
Joined: 16/07/2007
Posts: 1669
Re: Error #2038 when uploading
@anyone experiencing the #2038 error:

CKFinder 2.2 has just been released. The most important feature: HTML5 uploads should solve the problem with flash uploads forever.

Older versions of IE (including IE9) will still use flash, but because the (in)famous cookie bug in Adobe Flash does not affect IE, the #2038 error should be hopefully gone forever. Opera users will still see the flash uploader, but only till the release of Opera 12.

I'd like to apologize for having to wait so long for a solution for this annoying issue however it turned out there is really no way to workaround the cookie (and SSL) bug in certain situations, so we just had to finish HTML5 uploads, which we did not manage to introduce in 2.1.1.

Note for Safari users: the multiple file upload feature in HTML5 is currently disabled. Starting from version 5.1 there is a bug in Safari browser, which breaks the multiple file uploads. We need to wait for Apple to fix this bug. You can still upload many files at once if you drag&drop them though.

Wiktor Walc
CTO, CKSource -
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yveszx's picture
Joined: 27/10/2011
Posts: 11
Re: Error #2038 when uploading
WOW Thank you !!!!!
it was well worth the wait...

I just wish that CKsource was more open about this issue instead of just blaming adobe...
dyrge's picture
Joined: 09/05/2012
Posts: 5
Re: Error #2038 when uploading
Sorry for necroing the thread, but I am still receiving the 2038 error. It is happening on Windows 7, IE 9, with CKFinder 2.3 php version with the flash uploader plugin enabled. I have attempted to disable the flash uploaded, but doing so causes other problems as I outlined in this thread. Is there any solution for this?
dyrge's picture
Joined: 09/05/2012
Posts: 5
Re: Error #2038 when uploading
I am still having this issue, can anyone direct me in where to look to try and track down what is causing this issue?
gmblack's picture
Joined: 01/07/2011
Posts: 2
Re: Error #2038 when uploading
This is still a problem in IE9 using ckfinder 3.2

Support instructed me to install the latest version of Flash. Did that and still didn't work. So they directed me to this thread and the only option I see here is to disable the Flash upload. However if you do that then you can't do multi-file uploads.

The product page very clearly states that it works with IE6+.

Has anyone found a solution for this?
rhiley's picture
Joined: 10/12/2012
Posts: 1

I was getting the same error on my version. I turned off the flash uploader and thats when i got the following error. “Maximum request length exceeded”. When i goggled that, i found the issue was in my webconfig i needed to add the following code: 

<httpRuntime maxRequestLength="102400" />

Once added the issue went away.