An error occurs when using this code.

df = fdr.DataReader('USD/KRW', '1995')

HTTP Error 401: Unauthorized  - symbol "USD/KRW" not found or invalid periods

df = fdr.DataReader('DJI', '2015')

HTTP Error 401: Unauthorized  - symbol "^DJI" not found or invalid periods

The result of all the code is the same.

How can I fix this problem?

I tried to reinstall Python, Vscode, Googlechrome.