Key 'node-red-node-email/email: (en_US)' object not string

General
1

Node-RED V0.19.3 running on an Amazon Lightsail Ubuntu 16.04.5 LTS instance.

I have a simple flow for testing sending an email that used to work without any error.
However, it is now showing "key 'node-red-node-email/email: (en_US)' returned an object instead of a string.". The email is being sent ok though.

I suspect that some recent "messing about" has caused a problem with the email node not being able to locate it's 61-email.json file containing the en_US language strings.
Can anyone point me in the right direction to look at to see what has got damaged?
Thanks, Richard

2
3

Which version of the email node do you have installed ?
At which point and where is it showing that ?
before sending ? during send ? after send ?

4

The most recent version installed via npm.
The message shows when the node is fired.