Missing Alt text for Images in new theme

I have added a theme but my images are showing missing alt text but i have provided alt text in them this is my site. https://starlenze.com/

do you want to change ALt text of one image or multiple images.for a single image double-click the image and type the alt text in the text box.for multiple images use plugin

i am not able to understand what the issue is.
pm kisan status check aadhar card

The images on the theme doesn’t contain “alt” tag, it needs to be added to the all images.