i cannot make mex setup command to work on my matla2012a?

hello all, i am trying to use mex setup command on matlab 2012a but it does not work on my laptop, and i get the error "Previously accessible file "C:\Program Files\MATLAB\R2012a\toolbox\matlab\iofun\tempname.m" is now inaccessible." any ideas??

[Geoff Hayes]

bena - what happens if you type the following in the Command Window

 tempname

and/or

 which tempname -all

As tempname is a built-in function that generates a unique name for a temporary file, both of the above commands should return a unique file name and the path to the tempname.m respectively.

[bena]

the first one doesnt work while the second one "which tempname -all" returns "C:\ProgramFiles\MATLAB\R2012a\toolbox\matlab\iofun\tempname.m" i have windows 8 on my laptop and have installed SDK7.1, visual studo 2010. but still getting the same error again and again.

[Geoff Hayes]

What error do you get when you run tempname?

[bena]

>> tempname Previously accessible file "C:\Program Files\MATLAB\R2012a\toolbox\matlab\iofun\tempname.m" is now inaccessible. may be that's because maatlab is not confiigured properly on my laptop, I have tried everything but its not working. perhaps re installation of matlab can help??

[Geoff Hayes]

If you type

 open tempname

does the file open in the editor?

And, what does

 path

return? If there is a list, do you see the directory C:\Program Files\MATLAB\R2012a\toolbox\matlab\ iofun?