Error 502 bad gateway when the form is submitted

Hello,

I have this error ( 502 bad gateway ) when i validate my document. ( you can look the picture, on the email )  

Could you let us know if you are experiencing the issue when the submission is being edited or when the form is normally submitted? Is the form embedded on any of your web page? If so please share the web page URL where the form is embedded. Can we also send a test submission to see if we are able to replicate the issue at our end?

We will wait for your response. Thank you! 

Hello,
I encounter the problem when I finish typing my document and validate it.
Please find attached the type of document I need to register on Jotform.
Thanks for your help.
Cordially.
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Stéphanie CALMETTES
Assistante d’Exploitation
01 49 82 20 45
stephanie.calmettes.ext@aximum.fr
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AXIMUM IDF EST
19 Rue Louis Thébault 94370 SUCY EN BRIE
http://www.aximum.fr
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De : JotForm
Envoyé : mardi 3 décembre 2019 17:06
À : CALMETTES, Stéphanie - Ext (BRETIGNY)
Objet : Re: Error 502 bad gateway when the form is submitted
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Answered by Kiran
Could you let us know if you are experiencing the issue when the submission is being edited or when the form is normally submitted? Is the form embedded on any of your web page? If so please share the web page URL where the form is embedded. Can we also send a test submission to see if we are able to replicate the issue at our end?
We will wait for your response. Thank you!
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It looks like that you have attached the screenshot to the reply email. Please note that the images attached to the reply email cannot be posted back to the forum post. We request you to access the thread https://www.jotform.com/answers/2064505 by logging into your JotForm account and post the screenshot so that we can take a look. Please note that it is only possible to upload images to the forum. If you are trying to upload any other format files, we request you to upload the files to Google Drive or DropBox and share us with the link to check.

Also, please provide us with more information on validation of the document that you are referring to.

Thanks!