ICS Expression Builder issue

Summary

ICS Expression Builder issue

Content

Hi Team,

I have built the expression as "/nssrcmpr:execute/nssrcmpr:customObjects_24/nsmpr3:Lead_First_Name1 + " " + /nssrcmpr:execute/nssrcmpr:customObjects_24/nsmpr3:Lead_Last_Name1" but the value is resulted as "NaN" as seen in below error.

===============================================================

OSB-380001: Fault received on invocation of target :https://opn-ekulus.rightnowdemo.com/cgi-bin/opn_ekulus.cfg/services/soap <![CDATA[

Fault Code : soapenv:Sender

Fault String : Invalid ID: No Contact record found with LookupName = 'NaN'

Fault Details :

<n0:RequestErrorFault xmlns:n0="urn:faults.ws.rightnow.com/v1_3" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

   <n0:exceptionCode>BAD_ID</n0:exceptionCode>