can't upload images for property

from from end, I logged in as Agent. I can add property and all the information. The error is when I tried to upload photos for property.
after manually added photos and hit save button. I got this message:

Fatal error: Class 'OsImageHelper' not found in /usr/local/apache2/htdocs/Mysite/components/com_osproperty/helpers/helper.php on line 1231

Please help.
thanks

Dear Henry,
The issue has been fixed last night, please click on My downloads at the top to get latest OS Property version and install it to get this bug fixed.
Thanks
Dam

Hi Dam,
I downloaded the one you recommended then installed com_osproperty. The problem still remain.

Note: I just bought the product last night and it was version 2.8.1

Regards,
Henry

Hi Henry,
Please submit ticket and send your site information with super admin account. I will check and solve the problem for you
Thanks
Dam

Dam, same here.

when i try to upload images for property, property become no images. Just no reaction. I can see name of file, like "25.jpg" and thats all.
Version OS Property 2.8.1 bought a week ago.
Thank you.

Hi Mihail,
Please submit ticket and send your site information with super admin account so i can check the issue for you
Thanks
Dam