Unable to upload photos

[jeniytlk]

We are using Joomla version 1.5.23. We are unable to upload picture in the website. It shows that the image is "Not a valid image". I have tried with different sizes.

[christine]

Hi,
Joomla 1.5.23 is outdated resp. missing security pach to 1.5.26 https://docs.joomla.org/Joomla_1.5_version_history
More informations about Joomla versions: https://docs.joomla.org/What_version_of ... you_use%3F

Kind regards
Christine