Error when trying to HDL load in an address against a candidate

Summary:

Error when trying to HDL load in an address against a candidate

Content (required):

When actionig a HDL load against address for a candidate I am getting the following error

An error occurred. To review details of the error run the HCM Data Loader Error Analysis Report diagnostic test. Message details: Cannot invoke method reset() on null object.

my script is as below

any ideas why this is showing?

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):