This will not work with the social logins example, please follow the instructions on that page for that one specifically.
To run these examples, you can clone the Etherspot Prime SDK repo. Then cd into the directory and run: 
npm i && npm run init
Then create a .env file in the etherspot-prime-sdk directory. Within it we want to put something like this: 
WALLET_PRIVATE_KEY=YOUR_PRIVATE_KEY_HERE
CHAIN_ID=1
Please ensure to prefix your private key with “0x” so the SDK is instantiated correctly.
Then, you can try running the get address example like this: 
npm run 01-get-address
And it should output something like this to show the Etherspot SDK has been instantiated using the private key you used. 
> ./node_modules/.bin/ts-node ./examples/01-get-address

EtherspotWallet address: 0xb9798dF748E45F1fB724F50B7542802E5462a58a