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Support Article

Invalid reference to the zeroth(0) element in list



Pega Customer Service 8.3 is setup on Pega Platform 8.3.

Multiple exceptions are generted in the logs from different out-of-the-box reports. 
These excpetions occur from CPMDisplayDialog activity.

Error Messages

Type: java.lang.IndexOutOfBoundsException

Message: Invalid reference to the zeroth(0) element in list, pyAssignActions. Lists start from 1.

at at at at at at$StaticHelper.get( at com.pega.platform.clipboard.query.internal.PropertyReferenceProvider.getPropertyReference( at com.pega.platform.clipboard.query.internal.PropertyReferenceProvider.getPropertyReference( at com.pega.platform.clipboard.query.internal.ScalarValueQueryExecutor.invokeLegacy( at com.pega.platform.clipboard.query.internal.ScalarValueQueryExecutor.execute( at com.pega.platform.clipboard.query.internal.ScalarValueQueryImpl.resolveAgainstPage( at com.pega.platform.clipboard.query.internal.ScalarValueQueryImpl.resolve( at com.pega.platform.clipboard.query.internal.ScalarValueQueryImpl.resolveToString( at com.pegarules.generated.activity.ra_action_cpmdisplaydialog_790b1a8dd81081fc0a2abba7b8e6299e.step6_circum0( at com.pegarules.generated.activity.ra_action_cpmdisplaydialog_790b1a8dd81081fc0a2abba7b8e6299e.perform( at com.pega.pegarules.session.internal.mgmt.Executable.doActivity( at com.pegarules.generated.html_section.ra_stream_cpmdialog_447d3ce006866a12973b3841a850c68f.performStream_1( at com.pegarules.generated.html_section.ra_stream_cpmdialog_447d3ce006866a12973b3841a850c68f.execute(

Steps to Reproduce

Load a dialog on the Interaction screen in the Pega application.

Root Cause

A defect in Pegasystems’ code or rules.

newAssignPage.pyDefaultActionIndex was empty. Hence, it geneated the error in the CPMDisplayDialog activity's Step 6.


Apply HFix-61176.

Published April 16, 2020 - Updated December 2, 2021

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