Error message appears as soon as I begin to build my gantt chart

GanttProject Desktop Support
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I keep getting the following error message: Something went wrong

Cannot invoke “javafx.scene.control.TreeItem.getValue()” because the return value of “javafx.scene.control.TreeTableRow.getTreeItem()” is null

What can i do to resolve this? I keep scrapping my chart and restarting. I’ve deleted software and reinstalled. Not sure what else to do?

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Please share the error log (Help > View log) and a scenario that allows for reproducing this issue (e.g. “1. Create a task. 2. Do this, do that”)