diff --git a/src/main/scala/ALSAlgorithm.scala b/src/main/scala/ALSAlgorithm.scala
index 17c2806..81bd6c8 100644
--- a/src/main/scala/ALSAlgorithm.scala
+++ b/src/main/scala/ALSAlgorithm.scala
@@ -35,7 +35,7 @@
     require(!data.ratings.take(1).isEmpty,
       s"RDD[Rating] in PreparedData cannot be empty." +
       " Please check if DataSource generates TrainingData" +
-      " and Preprator generates PreparedData correctly.")
+      " and Preparator generates PreparedData correctly.")
     // Convert user and item String IDs to Int index for MLlib
 
     val userStringIntMap = BiMap.stringInt(data.ratings.map(_.user))