Hello Renat,
which version of the dcm4che Toolkit are you using?
If you are using version 3.3.7 (which you should, because it is currently the newest released version), then your XML format is not compatible with what the tool expects.
dcm4che 3 uses the DICOM XML representation as defined by the DICOM standard (see
http://dicom.nema.org/medical/dicom/current/output/html/part19.html#sect_A.1 )
To see what it looks like you can use the dcm2xml tool and convert an existing DICOM object to XML.
Hermann