As The error was completed because of the god Indra, he grants Hanuman a wish that his physique could well be as strong as Indra's Vajra, and that his Vajra could also not hurt him. In conjunction with Indra other gods have also granted him needs: the God Agni granted https://hanumanhindutemple.blogspot.com/2024/07/the-spiritual-haven-of-hanuman-mandir.html