Hi Hutchful,

In order to assist you with this issue we would need log files.
Can you please upload logs here ? (~\Portal\MonoX\ApplicationData\Logs)

Best regards,
Slaven

Okay, how do I download the log from the FileAdmin.aspx?

Hi Hutchful,

You can get logs directly from file system.
They're located in ~\Portal\MonoX\ApplicationData\Logs folder of your MonoX installation.

Best regards,
Slaven

Yes, I can see it. But I'm unable to copy it and upload. i haven't installed it locally, it's installed online.

snapshot

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Alright, so now i have the log file

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Hi Hutchful,

we are not sure which error cause the exception you have mention at the beginning of the post since log file has several exceptions in different times. 

We recommend that you first examine log file yourself, try to find the exact exception that caused the error based on your current time and time (and description) of exception and if you are unsure about the problem and its solution, then provide us with detailed exception so we can help you. 

Regards,
Željko

How about this, will it help?

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Hi Hutchful,

We have found this error in your log - Unrecognized attribute 'callback_url'. Note that attribute names are case-sensitive.
Can you please verify that the keys you entered in the web.config are valid?

Regards
Daniel