VERIFIED SOLUTION i

Resolve 'Expression error: Unknown identifier' encountered while testing a message template in Portrait Dialogue

Product Feature: Message/Master templates

Issue

While testing a message template in 'Message template designer' (a part of Visual Dialogue client), error 'Error Opening Provider 'MH TestMessageProvider': PD40000'(1): Expression error: Unknown identifier' occurs.

User-added image

Cause

This has been identified as a product defect

Resolution

UPDATED: June 14, 2017
This is resolved in Portrait Dialogue v6.1.4 Hotfix 2 and later releases hence upgrading to v6.1.4 Hotfix 2 or latest version should help.
As this error message occurs in Design mode, a possible workaround is to test the template in HTML mode.