I have developed a smart contract such that there are two types of tokens i.e. energy and power. I need to transfer each of them separately to an account address and as a result each address needs to have these two values (energy and power).

But when I define two types of balances for an address, i receive the following error :

Error: Undeclared identifier. Did you mean "balances"?
    return balancesPw[_owner];

I defined balances as follows:

mapping(address => uint256) balances;
mapping(address => uint256) Pwbalances; 

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