Javelin: InvokeProcessActivity fails with "Value cannot be null." error

Document ID : KB000115925
Last Modified Date : 26/09/2018
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When calling the "Invoke Process" Activity within Javelin, it fails with the following error displayed:

Or in the log:
{DATE} {TIME} - Error executing InvokeProcessActivity: Value cannot be null.
Parameter name: path1
Set "WorkingDirectory" parameter in the Invoke Process activity. This value is mandatory even when providing the full path to the executable name. Refer to Visual Work Flow Actions documentation.