Hello processing users,

I'm the very new processing user, so I try to overcome some problem when I write some little code.

I have made some basic animation to my web project with using processing js,
but when I worked on codes I meet a problem on println() ;

I got the error message following the lines and I dont know what is the meaning that and how can I overcome this.
Error message is 
processing.app.debug.RunnerException: It looks like you're mixing "active" and "static" modes.
    at processing.app.Sketch.preprocess(Sketch.java:1326)
    at processing.app.Sketch.preprocess(Sketch.java:1205)
    at processing.app.Sketch.build(Sketch.java:1568)
    at processing.app.Sketch.build(Sketch.java:1553)
    at processing.app.Editor$DefaultRunHandler.run(Editor.java:1485)
    at java.lang.Thread.run(Thread.java:619)

I think the problem line is "It looks like you're mixing "active" and "static" modes."

I want to see some changable number on my processing screen.
when I write println(x) x is a integer numbers which is changable,
I wonder that how can I use println easly for each value.

any advice will greate
thank you very much for the amazing program and forum.