Exception editing workflow from Execution Perspective

org.apache.hop.core.exception.HopException: 
Error opening workflow file '/files/etl/batch_dwh_load.hwf'

Unable to load the workflow from XML file [/files/etl/batch_dwh_load.hwf]

Unable to read file [file:///files/etl/batch_dwh_load.hwf]
Could not read from "file:///files/etl/batch_dwh_load.hwf" because it is not a file.



	at org.apache.hop.ui.hopgui.file.workflow.HopWorkflowFileType.openFile(HopWorkflowFileType.java:161)
	at org.apache.hop.ui.hopgui.delegates.HopGuiFileDelegate.fileOpen(HopGuiFileDelegate.java:108)
	at org.apache.hop.ui.hopgui.perspective.execution.WorkflowExecutionViewer.navigateToEditor(WorkflowExecutionViewer.java:729)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.apache.hop.ui.core.gui.BaseGuiWidgets.lambda$getListener$1(BaseGuiWidgets.java:216)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5796)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1529)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:5025)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4477)
	at org.apache.hop.ui.hopgui.HopGui.open(HopGui.java:464)
	at org.apache.hop.ui.hopgui.HopGui.main(HopGui.java:351)
Caused by: org.apache.hop.core.exception.HopXmlException: 
Unable to load the workflow from XML file [/files/etl/batch_dwh_load.hwf]

Unable to read file [file:///files/etl/batch_dwh_load.hwf]
Could not read from "file:///files/etl/batch_dwh_load.hwf" because it is not a file.


	at org.apache.hop.workflow.WorkflowMeta.loadXml(WorkflowMeta.java:456)
	at org.apache.hop.workflow.WorkflowMeta.<init>(WorkflowMeta.java:437)
	at org.apache.hop.ui.hopgui.file.workflow.HopWorkflowFileType.openFile(HopWorkflowFileType.java:142)
	... 14 more
Caused by: org.apache.hop.core.exception.HopXmlException: 
Unable to read file [file:///files/etl/batch_dwh_load.hwf]
Could not read from "file:///files/etl/batch_dwh_load.hwf" because it is not a file.

	at org.apache.hop.core.xml.XmlHandler.loadXmlFile(XmlHandler.java:550)
	at org.apache.hop.core.xml.XmlHandler.loadXmlFile(XmlHandler.java:531)
	at org.apache.hop.workflow.WorkflowMeta.loadXml(WorkflowMeta.java:444)
	... 16 more
Caused by: org.apache.commons.vfs2.FileNotFoundException: Could not read from "file:///files/etl/batch_dwh_load.hwf" because it is not a file.
	at org.apache.commons.vfs2.provider.AbstractFileObject.getInputStream(AbstractFileObject.java:1199)
	at org.apache.commons.vfs2.provider.AbstractFileObject.getInputStream(AbstractFileObject.java:1184)
	at org.apache.commons.vfs2.provider.DefaultFileContent.buildInputStream(DefaultFileContent.java:500)
	at org.apache.commons.vfs2.provider.DefaultFileContent.getInputStream(DefaultFileContent.java:342)
	at org.apache.hop.core.vfs.HopVfs.getInputStream(HopVfs.java:271)
	at org.apache.hop.core.xml.XmlHandler.loadXmlFile(XmlHandler.java:548)
	... 18 more
Caused by: java.io.FileNotFoundException: /files/etl/batch_dwh_load.hwf (File o directory non esistente)
	at java.base/java.io.FileInputStream.open0(Native Method)
	at java.base/java.io.FileInputStream.open(FileInputStream.java:219)
	at java.base/java.io.FileInputStream.<init>(FileInputStream.java:157)
	at org.apache.commons.vfs2.provider.local.LocalFile.doGetInputStream(LocalFile.java:105)
	at org.apache.commons.vfs2.provider.AbstractFileObject.getInputStream(AbstractFileObject.java:1197)
	... 23 more