Widget's Event not fire in Standalone mode

I got into this weird problem. In Standalone mode, my widget’s event not fire at all, even the Event Construct. When i create it and try to call it’s Custom event, nothing happened. None of these issues happened when i play in PIE mode.

Here is where i create my widget. It still got added to the screen but none of the events run.

I’m trying to print “Hello” to check but there is nothing
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I found the solution. What happened is that, i change an interface’s variable name and it not updated correctly into the widget ( which using that interface ). The variable’s name being shown in the widget blueprint is still the old one ( not update correctly - engine bug i guess, cause i have encounter this a lot ). So it cause a compile error. I just simply reopen the project, and it tell me where exactly the error it ( where the variable’s name updated incorrectly )