Can't use Java libraries

i am a begginer of kotlin and intellij idea.

when i use java libraries, like JDA, the ide says 

"None of the following functions can be called with the arguments supplied.
<init>(String?) defined in net.dv8tion.jda.api.JDABuilder
<init>(AccountType) defined in net.dv8tion.jda.api.JDABuilder"

but a weeks before, i can use that library on the same code.

mycode:

import net.dv8tion.jda.api.JDABuilder

fun main() {
    val jda = JDABuilder("token").build().awaitReady()
}

example on the JDA's readme:

JDA jda = new JDABuilder("token").build();

same error is seen in another library written in java.

how to resolve this problem?