Server Configuration

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Hi, I am doing email part. When I am doing the server configuration  the test email is get sent successfully but when I click on save configuration at that time it is showing me an error message that “An error occurred, contact your administrator so how to resolve this?”    
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3 answers
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What does your console say? What exactly is the error, including the stacktrace? 

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Hi, I have attached screenshot here.

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Your Encryption key should be exact of 32 characters.

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