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Fail to get the valid time information by using CSL_tscRead

In one of my project, I suddenly could not use CSL_tscRead to get the valid time information, while my other projects still could. It is so confusing. Can any of you could give me a hint on what may be going wrong?

Thanks a lot

Here is the code where I want to estimate the running time by using CSL_tscRead.

 CSL_Uint64 start, stop, overhead;

...

  // start the counter
  start = CSL_tscRead();
     memcpy((void *)src_imag, (void *)(src_imag_all+current_frame*INPUT_WIDTH*INPUT_HEIGHT), INPUT_WIDTH*INPUT_HEIGHT);
  // stop the counter
  overall_time = CSL_tscRead() - start;

...

In the watch window, start and overal_time are all zeros.

For this project, the build options are with full debug information without any optimization.