Can't read file in kotlin even though the file is in the same path as main.kt

I’m currently learning kotlin. Right now I am trying to learn file reading. For that I’m following the tutorial on Baeldung: https://www.baeldung.com/kotlin/read-file.
The problem I ran into is that the text file i have created and saved in the same folder as main.kt (../src/main/kotlin) is not being read in. It does not exist according to Intelij.

Here the functions I used

fun readFileLineByLineUsingEachLine(filename: String) = File(filename).forEachLine {
    println(it)
}

and

val inputStream: InputStream = File ("Kotlin2.txt").inputStream()
val inputString = inputStream.reader().use {it.readText()}
println (inputString)

I am using Ubuntu which I do not have much experience with. I hope I can find some help here.

Thank you.

>Solution :

The current directory, where it looks for the file, is not the directory that contains your main.kt. You can see where it’s looking by making this small change:

val inputStream: InputStream = File("Kotlin2.txt").absoluteFile.inputStream()

The absoluteFile "property" (which is actually a call to getAbsoluteFile()) makes it print an error message containing the full path.