DSP Builder fft megacore Error

I built a Simulink model with fft megacore. While running the model, the error came up:

"S-function should set the data type of input port 1 of 'fft_function/fft_v15_2' to the data type specified by the argument of method mdlSetInputPortataType"

But ths s-function is generated by the Altera DSP Builder Standard Blockset-Interfaces-Megacore Functions in the Simulink lib.