need help with native script add iOS platform

I created HelloWorld project by tns create HelloWorld. 

Afterwards I tried to add İOS and Android platforms. I typed tns platform add IOS but I get the following message 

No project found at or above ‘/Users/sezginozcan’ and neither was a --path specified.

I am a beginner with programming, any help ?

Hi @szgozcan,

I’m sorry, I don’t have enough information to give you a good answer. Could you give us a bit more context with what you’re doing? What program are you working in?