Getting axios error when trying to create wallet

I am using fireblock console. Currentely I have create two API user Ncw Admin and Ncw Signer by putting different Csr file and generated private key from there.
I want to ask how I can put keys in backend to create instanse of fireblock.
as currentely I am inputting api key for both signer and admin and also there private key

this.signer = new FireblocksSDK(apiSecretSigner, apiKeyNcwSigner, apiBase);
this.admin = new FireblocksSDK(apiSecretAdmin, apiKeyNcwAdmin, apiBase);

Hi Vivek,
Please look at the example below on how to declare environment variables.