Scala: The Util is not accessible in def main

[Soheil Pourbafrani]

Hi,
I want to use org.apache.spark.util.Utils library in def main but I got the
error:

Symbole Util is not accessible from this place. Here is the code:

val temp = tokens.map(word => Utils.nonNegativeMod(x, y))

How can I make it accessible?