I am having this error "Error: invalid address (argument="address", value=undefined, code=INVALID_ARGUMENT, version=address/5.7.0) (argument="vrfCoordinatorV2", value=undefined, code=INVALID_ARGUMENT, version=abi/5.7.0)"

[Vsatyam013]

Error: invalid address (argument="address", value=undefined, code=INVALID_ARGUMENT, version=address/5.7.0) (argument="vrfCoordinatorV2", value=undefined, code=INVALID_ARGUMENT, version=abi/5.7.0)

[TatyOko28]

This error means you are trying to use an undefined value as an address. It happens when:
The variable vrfCoordinatorV2 is undefined.
You are not passing a valid contract address when calling a function.
The network ID does not match the expected config (in helper-hardhat-config.js).