Daniel,
We see that your file home.js is changed. Unfortunately, as soon as you change the page code, IDE can no longer manage this code. It is marked with a blue and does not change, i.e. you can not add new handlers or delete old ones.
You will have to remove home.js and click "Undo" for entire folder WEB_RESOURCES. After this IDE is again able to generate the code for your event handlers.