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Errors are dealt with sequentially. Magnolia logs the error that first caused the failure. Rectifying the first error does not always solve the problem entirely but will help you to find the ultimate source. For example, if you try to send email and there is both a templating error and an error in your SMTP configuration, you will first need to resolve the templating error before you can see that there is also an authentication issue. See an example of error logging in the Mail module.

Once you know class name, configure logging to get more details.

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