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Aaron Drinkwater 5 posts 75 karma points

Jun 02, 2017 @ 10:25
0

Newsletter Studio - Something probably went wrong during the send out
Hi,
- Umbraco v 7.3.4
- Newsletter Studio v2.1.7
We've been experiencing an intermittent problem with sending emails from Newsletter Studio. Sometimes it sends fine, but more often than not we receive the following error:

NewsletterStudio, SendNewsletterService: Sequence contains no matching element : at System.Linq.Enumerable.First[TSource](IEnumerable1 source, Func2 predicate) at NewsletterStudio.Bll.Providers.SubscriptionProviderFactory.GetProviderByName(String uniqName) at NewsletterStudio.Bll.Providers.SubscriptionProviderFactory.GetReceiversBySubscriptionAlias(String value, SendOutParams parameters) at NewsletterStudio.Services.EmailTrackingItemService.CreateTrackingItems() at NewsletterStudio.Services.SendNewsletterService.SendEmails()

I originally thought it was to do with a custom subscription provider, so I removed all custom functionality, and upgraded Newsletter Studio to the latest version but the problem persists.

There doesn't seem to be any consistency to whether it will successfully send or not, and there are no errors in the logs, except that we are trying to send to Umbraco Member Groups (and not Newsletter Studio Mailing Lists).

From what I can tell, it looks as though it's failing to find the SubscriptionProvider, however there is definitely not any Member Groups being added or removed.

Is there anything I may have missed with configuration or any reason that Newsletter Studio might forget that a SubscriptionProvider exists?
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Markus Johansson 1938 posts 5866 karma points MVP 2x c-trib

Jun 15, 2017 @ 14:57
0
Hi!

Does this happen only when you send to members? You said that you had the same issue but with a custom provider? Does it happen randomly or can you reproduce it?

It might be that something goes wrong when the subscription provider is initiated and that the factory swallows the error.

Did you find any other errors in the log? If you look in your configuration, are you using the "NewsletterStudio.Bll.Providers.UmbracoNewSubscriptionProvider"?

Your config should look like this:
```
   <subscriptionProviders>
  <clear />
  <provider name="NewsletterStudioSubscriptionProvider" type="NewsletterStudio.Bll.Providers.NewsletterStudioSubscriptionProvider, NewsletterStudio" />
  <provider name="UmbracoNewSubscriptionProvider" type="NewsletterStudio.Bll.Providers.UmbracoNewSubscriptionProvider, NewsletterStudio" />
 </subscriptionProviders>
```
// m
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Newsletter Studio - Something probably went wrong during the send out