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https://issues.apache.org/jira/browse/FLEX-34350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028542#comment-14028542
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Adrian G commented on FLEX-34350:
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I found the cause of the problem in the above project. DataGridSkin.mxml now
defines a GridView factory.
> NPE, gridLayout.centerGridView is null
> --------------------------------------
>
> Key: FLEX-34350
> URL: https://issues.apache.org/jira/browse/FLEX-34350
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: DataGrid
> Affects Versions: Apache Flex 4.12.0
> Reporter: Alexander Mazuruk
>
> [Fault] exception, information=TypeError: Error #1009: Cannot access a
> property or method of a null object reference.
> at
> spark.components.gridClasses::GridHeaderLayout/updateDisplayList()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/spark/src/spark/components/gridClasses/GridHeaderLayout.as:199]
> at
> spark.components.supportClasses::GroupBase/updateDisplayList()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/spark/src/spark/components/supportClasses/GroupBase.as:1302]
> at
> spark.components::Group/updateDisplayList()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/spark/src/spark/components/Group.as:1179]
> at
> mx.core::UIComponent/validateDisplayList()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/core/UIComponent.as:9531]
> at
> spark.components::Group/validateDisplayList()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/spark/src/spark/components/Group.as:1101]
> at
> mx.managers::LayoutManager/validateDisplayList()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:744]
> at
> mx.managers::LayoutManager/doPhasedInstantiation()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:827]
> at
> mx.managers::LayoutManager/doPhasedInstantiationCallback()[/Users/justinmclean/Documents/ApacheFlex4.12.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1188]
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