Invalid user in get Stats

Hi,
I try to use statistics methods from API. I can get a data, except image statistics. I checked users.getTransferStats, images.getStats, albums.getStats. Everything is working normaly, but in tags with information for images I get fault error "invalid user"
Possibly I do something wrong. But what it means "invalid user"? Maybe I have not enough permissions? I'm ready to understand, if I get error response - I did mistake in request, but response is with stat "ok".
Thanks in advance.
I try to use statistics methods from API. I can get a data, except image statistics. I checked users.getTransferStats, images.getStats, albums.getStats. Everything is working normaly, but in tags with information for images I get fault error "invalid user"
Possibly I do something wrong. But what it means "invalid user"? Maybe I have not enough permissions? I'm ready to understand, if I get error response - I did mistake in request, but response is with stat "ok".
Thanks in advance.
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