In perspective i have following script:
you see the data as a string will be succesfull parsed to a dataset.
But with a long/integer it wouldnt do that 
It gives a java.lang.ClassCastException
it works if script the integer like this: [3] instead of only the 3.
strange but im helped…
The data parameter is supposed to be a list of rows (list of lists), which is why it works when you append [3] and not 3.