Exception in SendEmail activity when using Liquid expression in mail body

Hi,

I’m trying to evaluate Elsa workflow in a new project and i’m creating a POC following the document approval sample.

I’m building the workflow using the visual designer but when invoking it from postman, I receive the below error:

{
    "errorMessage": "Workflow faulted at 2021-08-24T08:22:35Z with error: An exception was thrown whilst setting 'SendEmail.Body'. See the inner exception for further details.",
    "workflow": {
        "name": null,
        "version": 15,
        "instanceId": "59f096ad0dca456bb3a7ce6c8dd2399a"
    }
}

After some digging, I found the error happens if I added this part to the email body: <a href="{{ "Approve" | signal_url }}">

but when I remove it, everything works fine.

So, I’ve two questions:

1. Why this issue happen?
2. Where can I find the detailed exception logs so I can check the inner exception?

[sfmskywalker]

I just realized I didn’t try the workflow designer part yet. That part is still broken for me, so I will update the sample + guide as necessary.

[sfmskywalker]

Great!

One more question please, let’s say I’ve hosted the server on IIS and this exception happened, where exception logs can be found in that case?

It depends on the log provider you install with your application. The Elsa sample projects only use the Console provider, but you can configure others, like EventSource, EventLog, Application Insights, and more. You can also use SeriLog as the logging provider, which makes it easy to write log entries to files on disk. Here’s a brief blog post that describes configuring SeriLog to log to files for ASP.NET Core.

I suggest to add a configuration to enable/disable returning the whole exception details in the response…It’ll be very helpful in troubleshooting production issues.

That’s a great suggestion. Thank you.