UDF does not runs from Zeppelin

[Gilad Landau]

Hi,
I'm trying to run simple UDF functions from Zeppelin and fail.
I'm using Zeppelin 0.5.6 and it's not even working on the simple Tutorial 
example, even though it does work from shell:

This is what I run:
def sentiment(s:String) : String = {
    val positive = Array("like", "love", "good", "great", "happy", "cool", 
"the", "one", "that")
    val negative = Array("hate", "bad", "stupid", "is")

    var st = 0;

    val words = s.split(" ")
    positive.foreach(p =>
        words.foreach(w =>
            if(p==w) st = st+1
        )
    )

    negative.foreach(p=>
        words.foreach(w=>
            if(p==w) st = st-1
        )
    )
    if(st>0)
        "positivie"
    else if(st<0)
        "negative"
    else
        "neutral"
}

// Below line works only in spark 1.3.0.
// For spark 1.1.x and spark 1.2.x,
// use sqlc.registerFunction("sentiment", sentiment _) instead.
sqlc.udf.register("sentiment", sentiment _)

This is the Error I get:

import scala.util.matching.Regex
import org.apache.spark.sql.functions.udf
lengthString: (element_path: String)Int
sentiment: (s: String)String
lengthString_udf: org.apache.spark.sql.UserDefinedFunction = 
UserDefinedFunction(<function1>,IntegerType,List(StringType))
res177: org.apache.spark.sql.UserDefinedFunction = 
UserDefinedFunction(<function1>,StringType,List(StringType))
org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in 
stage 140.0 failed 4 times, most recent failure: Lost task 0.3 in stage 140.0 
(TID 19712, hdn02): java.lang.ClassNotFoundException: 
$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$anonfun$1


Any idea what causes it and how to fix?

Thank you!