Xmlmc method invocation failed for BPM invocation node

[PeterL]

We have had a BPM fail with the below error nothing has changed within the BPM recently and all other tickets have not had this issue, after retrying the last step it sends out the notification email it is complaining about but does not progress. Any help would be great thanks.

[PeterL]

Custom_t field:

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[Victor]

@PeterL is there a GetRequest Detail node in that stage somewhere before the email node? If yes does Get Request Details node run when there is a value in Custom T?

[Victor]

Also:

 

[PeterL]

@Victor Hello yes there is and nothing has been changed and all other change tickets raised have been working fine. 

 

[Victor]

@PeterL PM me a copy of the BP definition file

[PeterL]

@Victor This has been sent thanks. 

[Victor]

To sum this up, the error occured because the value in the custom field had an ending comma. Email External Address node can be used to send emails to multiple addresses at once. This can be done via the Address field where the addresses needs to be separated by comma. This means that after each comma, the node expects an email address. Because the value ended with a comma, the node attempted to send an email to a nonexistent (null/undefined) address, hence the error.