Can't display chart from exchange

[c-paris]

Hello !

I'm on Angular 6 and I'm trying to display the BTC/USD chart from coinbase but it says "invalid symbol".
I know it's not React but its pretty similar maybe you can help.
I download the chart lib from the private github etc ...
This is a part of my component :

private _symbol: ChartingLibraryWidgetOptions['symbol'] = 'Coinbase:BTC/USD';
private _interval: ChartingLibraryWidgetOptions['interval'] = '15';
// BEWARE: no trailing slash is expected in feed URL
private _datafeedUrl = 'https://demo_feed.tradingview.com';
private _libraryPath: ChartingLibraryWidgetOptions['library_path'] = '/assets/charting_library/';
private _chartsStorageUrl: ChartingLibraryWidgetOptions['charts_storage_url'] = 'https://saveload.tradingview.com';
private _chartsStorageApiVersion: ChartingLibraryWidgetOptions['charts_storage_api_version'] = '1.1';
private _clientId: ChartingLibraryWidgetOptions['client_id'] = 'tradingview.com';
private _userId: ChartingLibraryWidgetOptions['user_id'] = 'public_user_id';
private _fullscreen: ChartingLibraryWidgetOptions['fullscreen'] = false;
private _autosize: ChartingLibraryWidgetOptions['autosize'] = true;
private _containerId: ChartingLibraryWidgetOptions['container_id'] = 'tv_chart_container';
private _tvWidget: IChartingLibraryWidget | null = null;

Thanks !