Meaning of "Duplicate name: A component named 'Builtin' already exists" lazarus / 55-TAChart ---------------------------------------------------------------------- Relativity · 2016-06-01 09:52 I' ve made an application with a few Forms containing each a TChart with TLineSeries, TBSplineSeries, TCubicSplineSeries. When I run the program, at the first statement of the type: XX.Create(Chart1); // where XX is a TLineSeries I get the run-time error: "Duplicate name: A component named 'Builtin' already exists" I have made ListChartSource's for every Series that I use, so I actually never use the built-in Source. What should I do ? ---------------------------------------------------------------------- howardpc · 2016-06-01 10:49 Rename the component which produces the name clash? ---------------------------------------------------------------------- wp · 2016-06-01 11:22 Please show some code. Quote from: Relativity on June 01, 2016, 11:52:56 amXX.Create(Chart1); // where XX is a TLineSeries If XX is the instance of the series to be created then you selected an at best inconventient, but probably incorrect way of creating an instance of a class. Use this instead: Code: Pascal  [Select][+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i var  XX: TLineSeries;begin  XX := TLineSeries.Create(Chart1); ---------------------------------------------------------------------- Relativity · 2016-06-01 13:50 I used the code posted by wp and it works perfectly. The problem is solved. Thanks to wp and howardpc.