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Problem when using optdl_tool of AER

Hello,

I am trying to use the AER library on C5535 eZdsp EVM board, and tuning the AER performance.

The AER release version is 16.1.0.3

When I use the optdl_tool including in the AER release package, it will show an error message and the program exits.

The message is as following

Extracting CTF archive. This may take a few seconds, depending on the
size of your application. Please wait...
...CTF archive extraction complete.
-------------------------------------------------------------
| Delay Analysis Tool (c) 2007-2012 Texas Instruments, Inc. |
| MATLAB(R). (c) 1984-2012 The MathWorks, Inc. |
-------------------------------------------------------------
Enter the sampling frequency of the adaptive filter (8000 or 16000): 16000
Enter the coefficients file name: .\examples\tail.txt
Enter the current y2x_delay: 0
??? Undefined function or method 'inv_fft' for input arguments of type
'double'.

Error in ==> getH at 59

Error in ==> find_opt_delay at 37

MATLAB:UndefinedFunction

Can anyone tell me how can I solve this problem?

Thanks