few errors in application and boss said I'm not made for development , eventhough I love working in my field. Devastated :(

Ignore him, people like him just get you down.
Keep trying and show him how wrong he is!

Take it easy dude, bugs are natural :)
Just because they are there doesn't mean you suck, at all!

You gotta keep going, I'm sure you can do it :D

Is your boss as well absolutely clueless about the technical part?

I wouldn't worry about it. The boss man probably has never been a coder.

Well he has much experience, but he is clearly underestimating me

You should not worry,bugs do exist in most software ,do not be discouraged by any person's oppinions.

At 20 years experience in this field (ok, subtract 6 for a social media gig that ruined my coding brain) I was told by a recent college grad that I sucked. Then I was fired and led out of the building quickly like I was an imposter. That was only 3 weeks into the gig and I was really ticked they didn't give me at least 3 months. Now they're going out of business and I have a job doing what I'm good at.

You do you. The world will self-correct through karma.