How to use the @cometchat-pro/react-native-chat.CometChat.BlockedUsersRequestBuilder function in @cometchat-pro/react-native-chat

getBlockedUsers(){
        var limit = 30;
        var blockedUsersRequest = new CometChat.BlockedUsersRequestBuilder().setLimit(limit).build();
        blockedUsersRequest.fetchNext().then(
            userList => {        
                console.log("Blocked user list received:", userList);   
                this.setState({blockedUsers: userList});     
            },
            error => {
                console.log("Blocked user list fetching failed with error:", error);
            }
        );
    }