Hi everyone! I am trying to create a chart, but I really don´t understand, what the phrases "Series, Value, Label, Key" really stand for. I created a database with a table: Month number January 4 February 12 So I connected the database with Jaspersoft, I ccreated a dataset and set the query SELECT month, number FROM database_name and now I have no idea how to continue. When I try to fill in all the fields in the Chart Wizard I will always get an error. Most of the time this one: Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number Can anyone tell me what the phrases stand for? Please don´t tell me to see the instructions, they just say what to do with the sample data and I am able to build this chart. Now I want to make a chart based on my data! :) These are the ones I am talking about: