Problem of project complie

Hi
I have added a member in transaction_builder.h for testing.
like this :slight_smile:
class TransactionBuilder
{
private:

public:
uint64_t mposition; //I added
TransactionBuilder() {}

but , when I compile the project always coming the err:
error: ‘class boost::optional’ has no member named ‘mposition’
could someone help me please?

I inputs the command as:
make clean
make