A template language occurred when sending a message (var parsing error)

[cnizzardini]

Getting this error:

A template language occurred when sending a message using Template 4155010: 
expression parsing error ## Access violation ## near ## {{var:url: ##

With this code:

        $msg = [
            'From' => [
                'Email' => $this->from,
            ],
            'To' => $this->getTo(),
            'Subject' => $this->subject,
            'TemplateID' => $this->template,
            'TemplateLanguage' => true,
            'Variables' => $this->vars,
            'TemplateErrorReporting' => [
                'Email' => Configure::read('email.default'),
            ],
            'TemplateErrorDeliver' => Configure::read('debug'),
        ];

        if (!empty($this->getBcc())) {
            $msg['Bcc'] = $this->getBcc();
        }
        if (!empty($this->replyTo)) {
            $msg['Reply-To']['Email'] = $this->bcc;
        }

        $response = $this->mailjet->post(Resources::$Email, ['body' => ['Messages' => [$msg]]]);
        if (!$response->success()) {
            Log::error(
                sprintf(
                    "Email error in %s: %s debug: %s",
                    self::class,
                    $response->getReasonPhrase(),
                    json_encode(['error' => $response->getData(), 'msg' => $msg])
                ),
            );
        }

Which sends this message data:

(
    [From] => Array
        (
            [Email] => no-reply@example.com
        )

    [To] => Array
        (
            [0] => Array
                (
                    [Email] => test@example.com
                )

        )

    [Subject] => Verify your email address
    [TemplateID] => 4155010
    [TemplateLanguage] => 1
    [Variables] => Array
        (
            [url] => http://localhost:8080/register/confirm?email=test@example.com&hash=5edeacca4c7946298dcc3024a5f0aaffe6a4269d
        )

    [TemplateErrorReporting] => Array
        (
            [Email] => support@example.com
        )

    [TemplateErrorDeliver] => 1
)

My template variable is this: {{var:url:""}}

Sidenote, can we get more examples in the documentation?

[cnizzardini]

I was declaring the variable twice in my template, I guess this is not allowed. After removing one of the url vars from the template it worked....

Mailjet should return a better error if this is the case. This is odd, because if I want a clear text URL and then a linkable button I have to declare two variables with the same data...

[oleksandr-mykhailenko]

Hello @cnizzardini
Than you for you notice here, we will improve our error handling for such cases