Hello,Please can you help me ? I am beginner. Where can be a bug ? /Kotlin/ Thanks

Put your mouse pointer above the red light bulb and Idea will tell you ... 🙂

only if there would be a message that tells you where is the bug.. Oh, wait, it's right on your screenshot and it says "no value passed for parameter 'context'"

Ok, but how can I fix the bug ? Thank you

Pass a context

This is the wrong outlet to answer these questions. As a beginning some better resources are https://stackoverflow.com and https://developer.android.com .

Ctrl+Click

or or inside () click

ctrl+p

to see the parameters to constructor to

CustomAdaptor()

As of Screen Shot is says to pass

context

and

courselist

parameters

ok,thanks