parse XML BIG5 encoding

I have a XML that is in BIG5 encoding.

When I try to parse it, this error appear in console:

[ERROR] :  Error Domain=com.google.GDataXML Code=-1 "The operation couldn’t be completed. (com.google.GDataXML error -1.)".   in -[TiDOMDocumentProxy parseString:] (TiDOMDocumentProxy.m:57)
[ERROR] :  : switching encoding: encoder error
[ERROR] :  : Blank needed here
[ERROR] :  : parsing XML declaration: '?>' expected
[ERROR] :  : Extra content at the end of the document

Is there a way to fix this? I'm building for iPhone and using 3.0.0.