It's rather straightforward Somewhere you're trying to convert double into string, but your workflow is expecting string value. Put some "log to history" actions in your workflow so that you will know where it crashes and which variables need  to get fixed

 Regards,

 Tomasz

Thank you Tomasz for your quick response.

I will give it another go and see what happens

Regards,

Claire

I think I may have resolved the issue, it was sending this message on a State Machine, I'm saving as I go and it seems to be okay.

Thank you

Regards,

Claire

Hey Claire,

If you've resolved your question, please mark an answer as "Correct" so others can benefit!