Why can't India produce Corona vaccine in bulk and give doses to all?

Why can't India produce Corona vaccine in bulk and give doses to all?

Amid rising Coronavirus cases and death toll, the only hope is the vaccine of Coronavirus. But why can't India produce the vaccine in bulk and help all the residents of India get the jab as soon as possible? Here is a report explaining the reason behind it Actually, the second wave ruined the plan of timely production of vaccine. Take a look