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it's the error I'm not good at programming but I try to learn. I am learning how to use javaFx. In this case I want to implement 4 operations: add, subtract, multiply and divide. When I was using only one it worked for me I am new to the Starck overflow community. I always check when I have doubts. But I did not find a solution to my problem. It would be very helpful if you support me. If you like me to share the folder. They explain to me how it would be very helpful. Also my english's not good but i'm learning to

kleopatra
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Bryan_uwu05
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    Please put the error, including the full stack trace, in your question. Also add the fxml file which the error message tells you contains the problem – tgdavies Jan 06 '21 at 23:19
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    do some research to learn, when stuck with a concrete problem come back with a [mcve] – kleopatra Jan 06 '21 at 23:21

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See this post on InvocationTargetException

See the Oracle Documentation on RuntimeException

See this post on javafx.fxml.LoadException

**As noted in the comments, the stack trace, in your case the red error text, tells you one of the problems: ** "Error resolving onAction = '$handleResta', either the event handler is not in the Namespace or there is an error in the script".

The comments are also asking for the file which contains the error, in order to help you more fully; We've identified that onAction = '#handleResta' is a problem problem, but we can't tell what about #handleResta is creating the error until you post this file:

/C:Users/Usuario/Downloads/Proy/build/classes/mvvm/FXMLVista.fxml:14
Cole Henrich
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    Ty so much for helping me. I was finding how use Scene Builder and some Examples. The problem was that when saving directly from Escene builder. The override is not automatically generated above each action. Like this @FXML void handleResta(ActionEvent event) { } – Bryan_uwu05 Jan 06 '21 at 23:59