Difficulty working with v-on:click

.service v-flex(xs12) v-toolbar(color="light-blue" dark tabs) v-toolbar-title Selected Candidates v-spacer v-layout(row wrap justify-center) v-btn(round color='success' v-on:click="start()">) strart

The function does not work … I tried click.native and also clict=$emit. But it did not help