Access denied when using mkdir in the plugins Excel

I am creating a plugins to use it in excel, and it generates me access denied error when mkdir is executed to create a folder in my current directory, how can I solve it?

[Jan]

Do you have write access to the current folder? Please check this again.

[Israel Hernández]

Yes, the write permission is activated. The program works from matlab, it does not send any errors. The problem arises when using the function from Excel.

[Guillaume]

Relying on current directory is always iffy. Use full paths. In particular, in compiled code the working/current directory is usually not the same as you get from interactive sessions.