Kapur says Tripathi makes him feel like he is in the wrong profession.
"Amish Tripathi is 'India's first literary pop star'. I drove here and thought may be I am in the wrong profession. May be I should just sit down and write books. It should be easier than making a film and handling actors, " the 67-year-old said here.
"When you are writing a book, your characters do what you exactly want them to do. When you are making a film, they (actors) have to go home, they have problems, their egos. But actually then, try writing one. You have no idea how difficult it is, " he added.
Kajol was also present at the launch and is all praise for Tripathi's writing style which she says even her nine-year-old daughter can easily understand.
"I am here today because I simply loved his books. I think they were fabulously written for the simple fact that they were so simply written. I know that I can tell my daughter, " Kajol said.
"Today she asked me, 'Where are you going?' I said, 'I am going for a book launch.' Then she asked me, 'Can I read it?' She is nine-and-a-half and I said, 'Yes. It gives me great pleasure to tell you that you can pick up from my library and read it'.
"It's that kind of a book that can interest my daughter and me at the same time, " Kajol added.
Tripathi's first book "The Immortals of Meluha" is being adapted into a film by Karan Johar.