Error reading multiple excel files in a loop - "Not valid OOXML File"

These are the steps I see:

  • make sure it is actually a valid Excel File
  • use the new Excel Reader (not the deprecated one) and see if that makes any difference
  • restart KNIME once with the “-clean” setting

You could provide us wth a sample of one file that would not load to reproduce the error; if it does not contain any sensitive informations.