An illegal instruction has been detected. when i use rfft function in sc573

I running the example "ADC_DAC Playback" and use the adc data to rfft but it gets the following error:

A non-recoverable error or exception has occurred.
Description: An illegal instruction has been detected.
General Type: RunTimeError
Specific Type: IllOpCodeDetected
Error PC: 0x00126896

rfft (inSignal, r_temp, r_output, twiddle_table, 1, (int32_t)FFTSIZE);