Report is not correct in XLS format

When I select other type, like XLS, for report output
the report format is not correct. There is some data
in header part of the received file, which are part of
the SOAP metadata.
Here is example:

^L ^@^@^@)^@)^@^@^B¢uuid:714C6C40-4531-442E-A498-3AC614200295^@^@^@http://schemas.xmlsoap.org/soap/envelope/^@^@^@<?xml version="1.0" encoding="UTF-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><soapenv:Body><ns1:runReportResponse soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns1="http://www.jaspersoft.com/client"><runReportReturn xsi:type="xsd:string">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;operationResult version=&quot;2.0.1&quot;&gt;
        &lt;returnCode&gt;&lt;![CDATA[0]]&gt;&lt;/returnCode&gt;
&lt;/operationResult&gt;
</runReportReturn></ns1:runReportResponse></soapenv:Body></soapenv:Envelope>^@^@
(other data ...)

----
g.c.