Ionic generate provider > EISDIR: illegal operation on a directory, read

Hi!

I am using CVS to save my project. So every folder has a CVS folder.
When I execute the ionic generate provider command, if the folder:

\node_modules\ionic-angular\templates\provider

has a CVS folder, it gives the error:
{ Error: EISDIR: illegal operation on a directory, read
at Error (native) errno: -4068, code: ‘EISDIR’, syscall: ‘read’ }

I have tried to put a .npmignore in the folder, but with no success.

Is there a way anyone knows to make it ignore the CVS files?

Thanks!