Excel Tools v2.2.5 - ERROR: Bundle com.appiancorp.ps.exceltools [56] Unable to get module class path. (java.lang.NullPointerException)

Hi

We've just upgraded Excel Tools to the latest version (2.2.5) from 2.2.4 and shortly thereafter the STDOUT logs have been filling up with the following message:- 

ERROR: Bundle com.appiancorp.ps.exceltools [56] Unable to get module class path. (java.lang.NullPointerException)
java.lang.NullPointerException

Has anyone seen this before, know what it means and how to resolve? 

Running 19.2 on AppianCloud.  

(I've posted the same on the Plug In page on AppMarket)

Many thanks

Paul

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