Here is my function:

setup() {
    this.orm = useService("orm")
    this.actionService = useService("action")
  
}

async getQuotations(){
    let domain = [['state', 'in', ['sent', 'draft']]]
    if (this.state.period > 0){
        domain.push(['date_order','>', this.state.current_date])
    }
    const data = await this.orm.searchCount("sale.order", domain)
    this.state.quotations.value = data

    // previous period
    let prev_domain = [['state', 'in', ['sent', 'draft']]]
    if (this.state.period > 0){
        prev_domain.push(['date_order','>', this.state.previous_date], ['date_order','    }
    const prev_data = await this.orm.searchCount("sale.order", prev_domain)
    const percentage = ((data - prev_data)/prev_data) * 100
    this.state.quotations.percentage = percentage.toFixed(2)
}

Here is the error:

Uncaught (in promise) TypeError: this.orm.searchCount is not a function

Thanks.