在Ubuntu機器上構建go代碼時遇到錯誤。我檢查了GOPATH變量，一切似乎都很好。下面是我得到的錯誤的堆棧跟蹤：/ go / src / Chaincodeexample $ go build＃_ / home / ubuntu / go / src / Chaincodeexample./Samplesupplychain.go:13:14: cannot refer to unexported name shim.logger./Samplesupplychain.go:91:5: syntax error: non-declaration statement outside function body下面是我的代碼：import("errors""fmt""encoding/json""github.com/hyperledger/fabric/core/chaincode/shim")var logger = shim.logger("my logger")//Create a struct for these 2 valuestype testuser struct{    Username string `json:"username"`    Fileuploaded string `json:"fileuploaded"`}//A function to create a user on the ledgerfunc CreateUser(stub shim.ChaincodeStubInterface, args []string) ([]byte, error){    if len(args) < 2 {        logger.Error("Invalid number of args")        return nil, errors.New("Expected atleast 1 argument for user creation")    }    var Username = args[0]    var UsernameInput = args[1]    //trying to understand    err := stub.PutState(Username, []byte(UsernameInput))    if err != nil {        logger.Error("Could not save new User to ledger", err)        return nil, err    }    var customEvent = "{eventType: 'UserCreation', description:" + Username + "' Successfully created'}"    err = stub.SetEvent("evtSender", []byte(customEvent))    if err != nil {        return nil, err    }    logger.Info("Successfully saved a supply chain user")    return nil, nil}func Checkuploadstatus(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {    logger.Debug("Entering supply-chain application")    if len(args) < 1 {        logger.Error("Invalid number of arguments")        return nil, errors.New("Missing details")    }    var Fileuploadedstatus = args[0]     bytes, err := stub.GetState(Fileuploadedstatus)     if err != nil {        logger.Error("Could not fetch Fileuploadedstatus with "+ Fileuploadedstatus +" from ledger", err)        return nil, err    }    return bytes, nil}給我想法解決這個問題。