Read Excel Plugin fails

We are on Appian 17.2. Until recently, the Read Excel Plugin worked fine on all of our environments. Now it is failing across all environments with this error. The error occurs even when trying with an Excel file that previously worked.

Caused by: java.io.FileNotFoundException: /tmp/poifiles/poi-ooxml-1478844220.tmp (No such file or directory)

Any ideas?

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