Error Message after upload

Hi, i use Nextgen Gallery Public Uploader and author of this plugin think the problem is in our Nexgen Gallery plugin.
I´am getting some error message after file is uploaded.
Upload is always successfull, but error mesage still shoving after upload
Here is screenshot:
https://dl.dropboxusercontent.com/u/9283029/uploader%20error.jpg

Please how can i disable this error mesage? Thanks

http://ww.wp.xz.cn/plugins/nextgen-gallery/