the runtime error null pointer exception is probably because you declared/called a variable wrong. If you have a static variable you can't call it using this.var. Either use the class (Class.var) or just get rid of the this.
static variables can't be called using this.var since it doesn't exist inside the specific object, it's shared by the class.
the runtime error null pointer exception is probably because you declared/called a variable wrong. If you have a static variable you can't call it using this.var. Either use the class (Class.var) or just get rid of the this.
static variables can't be called using this.var since it doesn't exist inside the specific object, it's shared by the class.