filter design hdl coder error

i tried to generate hdl from the example of the documentation , and i get this errors.

d = fdesign.lowpass('Fp,Fst,Ap,Ast',0.2, 0.22, 1, 60);

Hd = design(d, 'equiripple');  % Create filter

Hd.arithmetic='fixed';

generatehdl(Hd, 'Name', 'MyFilter'); %Generate VHDL code

Warning: Structure fir has symmetric coefficients, consider converting to structure symmetricfir for reduced area. 
> In C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@abstractdffir\setimplementation.p>setimplementation at 30
  In C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@AbstractHDLFilter\generatehdlcode.p>generatehdlcode at 14
  In C:\Program Files\MATLAB\R2012a\toolbox\hdlfilter\hdlfilter\privgeneratehdl.p>privgeneratehdl at 52
  In dfilt.basefilter.generatehdl at 51 
Warning: Structure fir has symmetric coefficients, consider converting to structure symmetricfir for reduced area. 
> In C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@abstractdffir\setimplementation.p>setimplementation at 30
  In C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@AbstractHDLFilter\getImplementationStr.p>getImplementationStr at 7
  In C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@AbstractHDLFilter\baseMakeComment.p>baseMakeComment at 26
  In C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@AbstractHDLFilter\makeComment.p>makeComment at 7
  In C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@AbstractHDLFilter\generatehdlcode.p>generatehdlcode at 29
  In C:\Program Files\MATLAB\R2012a\toolbox\hdlfilter\hdlfilter\privgeneratehdl.p>privgeneratehdl at 52
  In dfilt.basefilter.generatehdl at 51 
Error using hdlmakecodegendir (line 15)
Cannot create new directory hdlsrc.

Error in C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@AbstractHDLFilter\makehdl.p>makehdl (line 8)

Error in C:\Program Files\MATLAB\R2012a\toolbox\shared\hdlshared\@hdlfilter\@AbstractHDLFilter\generatehdlcode.p>generatehdlcode (line 40)

Error in C:\Program Files\MATLAB\R2012a\toolbox\hdlfilter\hdlfilter\privgeneratehdl.p>privgeneratehdl (line 52)

Error in dfilt.basefilter/generatehdl (line 51)
  privgeneratehdl(filterobj,varargin{:});

Answer 1

[Walter Roberson]

You are encountering multiple warnings, but the error to pay attention to is

Cannot create new directory hdlsrc

What directory are you in when you run generatehdl, and do you have permissions to create new subdirectories there? Are you using Windows 7 with User Access Control enabled? If so then if your current directory is anywhere underneath "C:\Program Files" then UAC will block you from creating directories unless you are running as Administrator.