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Support Article

Error occurs on clicking Save on Screen Flow



When using the standard Screen flow harness, error occurs on clicking Save on any screen of the Screen flow.

Error Messages

Error in logs:

Exception caught while evaluating When The reference * is not valid.  Reason: invalid property name: '*'

Section 'pyCaseActionAreaButtons' execution error on page 'pyWorkPage' of  class 'ABC'. Error evaluating visible when 'wxpyAddCancel'.

Steps to Reproduce

  1. Create a screen flow using the TabbedScreenFlow7 harness.
  2. Navigate to the screen flow during runtime.
  3. Click Save after making some changes.

Root Cause

A defect in Pegasystems’ code or rules.

Issue with the When condition in the out-of-the-box pyAddCancel When rule. The condition now is .pxFlow(param.flowName).pyFlowParameters.bAddCancel. However, in some scenarios, the flowName parameter is deleted before the pyAddCancel When rule is run.


Perform the following local-change:
  1. Save As the pyAddCancel When rule to the application ruleset
  2. Replace .pxFlow(param.flowName).pyFlowParameters.bAddCancel with .pxFlow(newAssignPage.pxFlowName).pyFlowParameters.bAddCancel in the When condition as newAssignPage.pxFlowName always has a value.

Published August 24, 2018 - Updated October 8, 2020

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