GPArray::add() returns ERROR when reading a complex chain

Hi

I have a model with a complex chain. And it will go into following code when reading the model.

case ICurvePrimitive::CURVE_PRIMITIVE_TYPE_InterpolationCurve:
case ICurvePrimitive::CURVE_PRIMITIVE_TYPE_AkimaCurve:
default:
{
    bIsGPArray = true;

    if (SUCCESS != gpa->Add(*curveVector.get()))
        break;
    ....
}

But the return value of "gpa->Add(*curveVector.get()" is ERROR, can I regard the toolkit could not add such type of curve into GP array?

The complex chain is like:

Thanks,

Richard