Invalid arguments on Doc.insertPages - Acrobat SDK

[B50 I01 Ángel29139009gdod]

I'm trying to insert a page into an attachment of a PDF. I have a main pdf file called "Ctrl.pdf" that has several attachments. Inside a Trusted Function called via button in "Ctrl.pdf" I get the Doc of the attachment:

att = this.openDataObject("myAttachment.pdf");

Then I try to insert a page to that attachment:

att.insertPages ({
    nPage: 0,
    cPath: "/c/new-pages.pdf",
    nStart: 0
});

But get the following error: 
InvalidArgsError: Invalid arguments.
Doc.insertPages

I dont see how the arguments are wrong, I'm sure the location is correct, also tryed with relative path but nothing changed.

[kglad]

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<moved from using the community>

[Bernd Alheit]

Try this :

Put the file in a folder of the C drive

E.g. /C/temp/...

[try67]

I thought that might be the case, too, but it doesn't seem to be. It seems some types of editing of the attached document are allowed, and others are not... It's very odd. It might have to do with the fact that it is opened as a hidden document, instead of being displayed on the screen. For example, I was able to modify the file's metadata using a similar code, but not the pages in it.

[B50 I01 Ángel29139009gdod]

Thamks for the reply, but it doesn't seem to be the problem, previously the file was in a subfolder and the error was the same.