'class 'x' is not abstract and does not implement abstract member public abstract fun y...' in kotlin, what does this mean?

This error signifies that a non-abstract class is inheriting from an abstract class or interface but not implementing all of its required members.

Example:

interface Speaker {
    fun speak()
}

class Person : Speaker

Solution:

interface Speaker {
    fun speak()
}

class Person : Speaker {
    override fun speak() {
        println("Hello")
    }
}

Ensure that all abstract methods from interfaces or abstract classes are overridden and implemented.