Why does the Cannot read property 'setState' of undefined error occur?

Question

JavaScript

Where is the error in the resetUsers: this.handleAlertDismiss method?
Cannot read property 'setState' of undefined

super(...props);
        this.state = {
           showModal: true,
            ...
           //handleAlertDismiss Не работает
            resetUsers: this.props.resetUsers || this.handleAlertDismiss
        };
        this.handleAlertDismiss = this.handleAlertDismiss.bind(this);
    }

    handleAlertDismiss() {
        this.setState({showModal: false});
    }

    render() {
        const {resetUsers} = this.state;
        return (
            <div>
                <Modal show={this.state.showModal} bsSize="sm">
                         <Alert bsStyle={this.state.alertStyle} 
                                   showModal={this.state.showModal} 
                                   onDismiss={ this.state.resetUsers }>
                           
                                <Button onClick={resetUsers} >Gotcha!</Button>
                        </Alert>
                </Modal>
            </div>
        );

Answer 1

There is an error in your constructor. You first put the value of the link to the function in this.state.resetUsers , then you redefine this function through bind, but this.state.resetUsers remains with the old link. In javascript, copying and passing is done by sharing
Solutions
1) Bindim in the forehead
2) Instead

this.handleAlertDismiss = this.handleAlertDismiss.bind(this);

write
3) Making the right link

constructor() {
    super(...props);
    this.handleAlertDismiss = this.handleAlertDismiss.bind(this);
    this.state = {
      showModal: true,
      resetUsers: this.handleAlertDismiss
    };
  }