ModalContext$ModalContextThread.run() has thrown a KettleException

We found this prefix in 2 webpages.
MapChildren (2)Typical messages (1)TraceDetailed Map
  1. org.pentaho.di.core.exception.KettleException
    1.   at org.pentaho.di.trans.Trans.prepareExecution()
    2.   at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog.doPreview()
    3.   at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog.access$000()
    4.   at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog$1.run()
    5.   at org.eclipse.jface.operation.ModalContext$ModalContextThread.run()
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MessageNumber of crashes
We failed to initialize at least one step. Execution can not begin!2
  1. org.pentaho.di.core.exception.KettleException
    1.   at org.pentaho.di.trans.Trans.prepareExecution()
    2.   at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog.doPreview()
    3.   at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog.access$000()
    4.   at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog$1.run()
    5.   at org.eclipse.jface.operation.ModalContext$ModalContextThread.run()