Jop V. Jop V. - 4 months ago 19
Dart Question

"NoSuchCapabilityError: no capability to invoke the method" when assigning an action to a button

main_app.html:

<dom-module id="main-app">
*snip*
<template>
*snip*
<paper-button on-tap="nextStep" raised>Next step</paper-button>
<p>The step is {{step}}</p>
</template>
</dom-module>


main_app.dart:

@HtmlImport('main_app.html')

*snip*

@PolymerRegister('main-app')
class MainApp extends PolymerElement {
*snip*

@property int step = 0;

MainApp.created() : super.created();

*snip*

@reflectable
void nextStep() {
step = step + 1;
print('Next step!');
}
}


When I run this and press the button, I get this error in Dartium's console:

NoSuchCapabilityError: no capability to invoke the method 'nextStep'


What am I doing wrong?

Answer

Please try

void nextStep(event, [_]) {

or

void nextStep([_, __]) {
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