Can’t display nested SOQL data in Conga Word template

On Salesforce, I have an SOQL Query

Problem with – Query Five Levels of Parent-to-Child Relationships in SOQL Queries

I am trying to use this line of Apex code to polulate a List.

Join SOQL Tables

I am trying to join tables in in my Salesforce environment but am getting a MALFORMED_QEURY error.