JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[claudio-1980]

As you can see, I have the connection established, but when trying to make a request to the Mainnet account I receive the error "JSONDecodeError: Expecting value: line 1 column 1 (char 0)"

When I try with the Testnet account it works perfectly.

Help please!!!!!!