Very thanks for your help!!!
We have found the problem
Main Problem:
when you click on capture the image will be put into directory /images/_tmp/ but if directory not exist the system get a error, on your site "
http://sosedi.ml/" works because you have uploaded image without webcam and system have created this folder.
Another small Problem:
in file /administrator/components/com_jsn/helpers/fields/image.php at line 314 replace this:
echo JURI::root() . '/images/_tmp/' . $file . '?'.time();
with this
echo JURI::root() . 'images/_tmp/' . $file . '?'.time();
now returned image have this path
http://your-site.com//images/_tmp/something.jpg, some browser ignore double char "/" but not all.
we will fix these problems in next release (next week
).