<Intent (into holder) doesn't start the Activity> ...

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Intent (into holder) doesn't start the Activity
I'm trying to learn kotlin and I'm following a

tutorial▾

for a notes app
at 10619 (testing the app) my code doesn't open the "Update" view
I added a Toastto verify that updateButton.setOnClickListener works and the message is shown but the intent seems not to be started.
This is kt file code (if other files are needed please let me know it)
package...