stopped creating sitemap

hi there,
i have been using this plugin for about 6 months. i had to uninstall it to work on some other site issues, but now reinstalled it.

for some reason, it no longer will create a sitemap or do anything. when i click ‘create sitemap’ from the settings page, it just loads a blank screen.

can you help me figure out how to fix?
thanks
tom

https://ww.wp.xz.cn/plugins/udinra-all-image-sitemap/