The error is in your first shell action "cutoff_values_table". You've got the letter "z" at the end of the line. <argument>-t</argument>z
Remove it and the XML validates. As an aside, if you want, you can make your workflow a bit smaller by reducing the number of <argument> tags. The contents of <argument> tags are space-delimited in the order that they are declared, so you could turn <argument>-c</argument>
<argument>${value}</argument> into <argument>-c ${value}</argument>
for example.
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