Error: expected a type

Error: expected a type

I am trying to use an open source class whose .h file starts with:
template <class DT>
class FFTReal
{
public:
enum { MAX_BIT_DEPTH = 30 };
typedef DT DataType;
explicit FFTReal (long length);
...
my first creating a pointer to the class in my private section of my class:
ffft::FFTReal<double> *m_fft_object;
And then, within an initialization function, create it with
m_fft_object = new fft_object((long)(FFTWindowSize));
It is in this last line that I get the error "Error:expected a type". I
have done some searches for the error but nothing seems to match my
particular problem.
Thanks