Problem with running project in NetBeans 6.9

[Applesap]

Hello

Today I downloaded NetBeans 6.9 because I have to make a JavaFXschoolproject with it. Everything worked but when I tried to run my project I got an error (wrong JDK, you have 1.8 where 1.7 is required) I solved this problem by installing the right JDK. When I try to run a project, I now get the following error: cannot start Java.exe. Do you guys know how I can solve this problem? I tried to find a solution on internet, but after several hours I still get the same error.

[Applesap]

Hello,

The past few day I tried a lot of posiible solution. At a point where I was almost going to give up I downloaded the latest version of Java, this resulted in an other error when I run a project:

java.lang.NoSuchMethodError: javafx.stage.Stage.<init>(Z)V
at Schaakbord.Schaakbordlang$1Local$1.doit$$0(Schaakb ordlang.fx:33)
at Schaakbord.Schaakbordlang$1Local$1.doit$$0(Schaakb ordlang.fx:33)
at Schaakbord.Schaakbordlang.javafx$run$(Schaakbordla ng.fx:33)
at Schaakbord.Schaakbordlang.javafx$run$(Schaakbordla ng.fx:33)

(Schaakbord is my package name and Schaakbordlang is the name of the file I try to run)
I hope there is someone out there who can and wants to help me with this next problem.