I have been getting a lot of emails asking me about this issue, saying that there are more then one "/Type /Pages" inside their PDF file.
YES! But only one of those is the ROOT set.
Example Of a ROOT Identifier Set:
Example of what is NOT the root node:
Notice that in the second example there is a "/Parent" tag. This means that the second one is NOT the root. The first example however does NOT have a "/Parent", which means it IS the ROOT.
I hope this clarifies it for everyone.