I am trying to use unpack_action_data.

void apply(const account_name contract, const account_name act) {

        if (act == N(transfer)) {
            transferReceived(eosio::unpack_action_data<currency::transfer>(), contract);

Getting an error:

2725650ms thread-0 main.cpp:2493 main ] Failed with error: Assert Exception (10) !"unresolvable": env.free

What header file is missing? I do not see it anywhere


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