Unable save project

Hi,

I urgently need help for this. Initially the plugin works well to add new projects and images. However, after adding about 4 to 5 projects, the plugin will not be able to add new projects or images. But i am still able to do so with the video. I have try to deactivate the plugin and activate again and also change to other theme but it all wont work. Any idea how i can solve this?

i have emailed you guys but so far has not gotten any reply yet

https://wordpress.org/plugins/portfolio-gallery/