# This event encountered an error - Why?

**URL:** <https://forum.mautic.org/t/this-event-encountered-an-error-why/23921>\
**Category:** Product Support\
**Created:** [April 28, 2022, 9:30am UTC](https://forum.mautic.org/t/this-event-encountered-an-error-why/23921 "2022-04-28T09:30:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Sina-masina](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/sina-masina/32/6909_2.png) [@Sina-masina](https://forum.mautic.org/u/Sina-masina)\
**Post date:** [April 28, 2022, 9:30am UTC](https://forum.mautic.org/t/this-event-encountered-an-error-why/23921/1 "2022-04-28T09:30:02Z")

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Guys,

I need some help …

I’m new in Mautic and now I learn how this tool works. 😉

I have created:

**Segment 1**  
**Segment 2**

**Form 1 (which modify contact to segment 1 and send email to contact)**  
// This form is classical email subscription form  
**Form 2 (which modify contact to segment 2 and send email to contact)**  
// This form is classical “get free ebook” form

I also created campains:

Campain 1 (triggered when contact added to segment 1)  
Campain 2 (triggered when contact added to segment 2)

**Emails in both campains are identica (Except for the first one which comes from form)l!**

Now I have one question …

If I subscribe to both forms with my mail and do a test …

- I will get both first emails added in forms (for Form 1 & 2)

After that both campains triggers but I recives only emails from first subscribed.  
For secound subscription I can see error on contact:  
_This event encountered an error during the last attempt to process_

Why is this happening?  
Is Mautic so smart and knows that people get the same email and will not send the identical one more time?

Did I don everything okay? Or did I set anything wrong?

Thank you and regards,  
Sina

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**Author:** ![joeyk](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/joeyk/32/11164_2.png) [@joeyk](https://forum.mautic.org/u/joeyk)\
**Post date:** [April 28, 2022, 9:43am UTC](https://forum.mautic.org/t/this-event-encountered-an-error-why/23921/2 "2022-04-28T09:43:06Z")

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> [@Sina-masina](#):
>
> This event encountered an error during the last attempt to process

Can you click on the icon next to : " _This event encountered an error during the last attempt to process_"  
in your timeline? Maybe there is more explanation.

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**Author:** ![Sina-masina](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/sina-masina/32/6909_2.png) [@Sina-masina](https://forum.mautic.org/u/Sina-masina)\
**Post date:** [April 28, 2022, 9:52am UTC](https://forum.mautic.org/t/this-event-encountered-an-error-why/23921/4 "2022-04-28T09:52:51Z")

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Oh, yes … sorry for that!

I didn’t know that I can click on that icon. ☹

It says: _Last execution error: @mymail.com has already received this marketing email._

THANK you so much!  
Sina

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**Author:** ![joeyk](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/joeyk/32/11164_2.png) [@joeyk](https://forum.mautic.org/u/joeyk)\
**Post date:** [April 28, 2022, 3:47pm UTC](https://forum.mautic.org/t/this-event-encountered-an-error-why/23921/5 "2022-04-28T15:47:49Z")

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You are welcome 😃