Issue with Email

[teiledeinebotschaft]

Please help me to send out confirmation email and their attributes with api
Used this but still showing error
$attributes = [
'address_field' => $email,
'contacts' => [$contactId],
'user_id' => 1,
'html_content' => '

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'plain_content' => 'Test',
'subject' => 'Email STatus',
];
$contact2 = $infusionsoft->emails()->send($attributes);

Error -
Server error: POST https://api.infusionsoft.com/crm/rest/v1/emails/queue? resulted in a 500 Internal Server Error` response:
{"message":"General error"}