Problem Occurred cannot be cast to org.eclipse.core.internal.dtree.DataTreeNode

Getting this error trying to reopen katalon project. Haven’t changed anything in project besides trying to clean up tests as new code has caused errors. Please advise:

org.eclipse.core.internal.dtree.NoDataDeltaNode cannot be cast to org.eclipse.core.internal.dtree.DataTreeNode
org.eclipse.core.internal.dtree.NoDataDeltaNode cannot be cast to org.eclipse.core.internal.dtree.DataTreeNode

@“Amanda Perkins”: I think you should post the error screenshot and your sample code here to have more details

ended up closing it and reopening it. basically blew away the old katalon app from my computer and re-downloaded it and it worked fine