Connector/C++ MySQL error code: 2014 , SQLState: HY000 and Commands out of sync error why ? (no replies)

Hi im using Connector/C++ and executing simple 2 sql commands like this : the first select sql run ok but the second one cause this exception error :

ERR: Commands out of sync; you can't run this command now (MySQL error code: 2014, SQLState: HY000 )

here is the code :
//member of the class
ResultSet *temp_res;
// in different method
m_driver = get_driver_instance();
m_con = m_driver->connect(m_DBhost,m_User,m_Password);
m_con->setSchema(m_Database);

//here i excute the querys :
vector<string> query;
query.push_back("SELECT * FROM info_tbl");
query.push_back("INSERT INTO info_tbl (id,name,age)VALUES (0,foo,36)");
query.push_back("SELECT * FROM info_tbl");

ResultSet *res;
Statement *stmt;
bool stmtVal = false;

try{
stmt = m_con->createStatement();
for(size_t i = 0;i < querys.size();i++)
{
string query = querys.at(i);
stmtVal = stmt->execute(query);

if(!stmtVal)
{

string error_log ="sql statment:";
error_log.append(query);
error_log.append(" failed!");

cout << error_log << endl;
break;

}
}
if(stmtVal)
{
if(returnSet)
{
res = stmt->getResultSet();
temp_res = res;
}
}



delete stmt;
//close connection to db
m_con->close();
} catch (sql::SQLException &e) {
......
}


his is my simple table :

Column Type Null
id int(10) No
name varchar(255) No
age int(10) No