LDAP generating null error

i’m trying to make an LDAP search for multiple value at the same time. I’m getting a value from pipeline parameter, which is a space separated string and i need to split the string and make filter condition for each string. filter condition is correct, but while validating my ldap is generating null error… please resolve
here is a screenshot of my pipeline:

If you believe this is an error in the Snap, submit a ticket to SnapLogic Support at support@snaplogic.com.

Looks like the Filter is referencing data form your input. Can you confirm what you trying to reference does exist in all documents you are feeding to the LDAP Search snap?