broken symbo link after creation on web hosting using cron job

I have set up cron job:

ln -s /home/username/public_html/book_donation/storage/app/public/images/ /home/username/public_html/book_donation/public/storage/

and also tried:

ln -s /home/username/public_html/book_donation/storage/app/public/images /home/username/public_html/book_donation/public/storage

but every time the link is created it says it is broken how to fix this?

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