javafx exception : Controller value already specified

Question

I\'m calling a method to load a window by passing some parameters to a specific internal method of this window, but I\'ve got this exception:

GRAVE: null
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Answer 1

Remove the fx:controller attribute from the FXML file. That attribute is an instruction to the FXMLLoader to create a new controller: since you have already set one by calling setController it is contradictory.

JavaFX Error: Controller value already specified

This guy answered it ^ Props to him!