[BUG]: Not able to run VectorUDF from Synapse notebook

[selvavm]

Describe the bug
I am getting file not found '' when I follow the VectorUDF example in Synapse Notebook.

To Reproduce

//Cell 2
var names = new List<string> { "john", "20" };

var df = spark.CreateDataFrame(
    new List<GenericRow>{new GenericRow(names.ToArray())},
        new StructType(
        new List<StructField>()
        {
            new StructField("name", new StringType()),
            new StructField("age", new StringType())
        }));


//Cell 3
private static FxDataFrame CountCharacters(FxDataFrame dataFrame)
{
    int characterCount = 0;

    var characterCountColumn = new Int32DataFrameColumn("nameCharCount");
    var ageColumn = new Int32DataFrameColumn("age");
    ArrowStringDataFrameColumn nameColumn = dataFrame.Columns.GetArrowStringColumn("name");
    for (long i = 0; i < dataFrame.Rows.Count; ++i)
    {
        characterCount += nameColumn[i].Length;
    }

    if (dataFrame.Rows.Count > 0)
    {
        characterCountColumn.Append(characterCount);
        ageColumn.Append(dataFrame.Columns.GetInt32Column("age")[0]);
    }

    return new FxDataFrame(ageColumn, characterCountColumn);
}

//Cell 4
df.GroupBy("age")
.Apply(
    new StructType(new[]
    {
        new StructField("age", new IntegerType()),
        new StructField("nameCharCount", new IntegerType())
    }),
    r => CountCharacters(r))
.Show();

Expected behavior
Get a new dataframe with counts

Screenshots

Desktop (please complete the following information):

• OS: Synapse Notebook
• Browser Edge
• Version

Additional context
I have not tried this in any other environment