Can anyone please help with following error?

Name cannot begin with the '6' character, hexadecimal value 0x36. Line 1, position 56.<SOAP-ENV:Envelope xmlns:SOAP-ENV="">schemas.xmlsoap.org/.../"><SOAP-ENV:Body><SOAP-ENV:Fault xmlns:af="">www.aras.com/.../faultcode><faultstring><![CDATA[Name cannot begin with the '6' character, hexadecimal value 0x36. Line 1, position 56.]]></faultstring><detail><af:legacy_detail><![CDATA[Name cannot begin with the '6' character, hexadecimal value 0x36. Line 1, position 56.]]></af:legacy_detail><af:exception message="Name cannot begin with the '6' character, hexadecimal value 0x36. Line 1, position 56." type="System.Xml.XmlException"/></detail></SOAP-ENV:Fault></SOAP-ENV:Body></SOAP-ENV:Envelope>