调用获取模拟模拟账户下rb2605的手续费率

代码如下：

        Integer i;
        For i = 0 To A_AccountCount() - 1
        {
        
            //获取账户对应合约的手续费率
            CommissionRate cRate;
            ret = A_GetCommissionRate(Symbol, cRate, i);
            Print("A_GetCommissionRate合约" + Symbol + "的手续费率:" + IIFString(ret, "True", "False") + "\n" + Text(cRate));
            
            //获取账户对应合约的保证金率
            MarginRate mRate;
            ret = A_GetMarginRate(Symbol, mRate, i);
            Print("A_GetMarginRate:" + IIFString(ret, "True", "False") + "\n" + Text(mRate));
            
        }

确定模拟账户一定登录并绑定了，返回值如下：

问题：

1. 为什么A_GetCommissionRate返回了False