Failure to use the SMS service of the Traccar SMS Gateway application

Hello everyone, I have my traccar server configured to send push and web notifications, however it asked me to send SMS as well, so I decided to use the traccar SMS gateway app, however the SMS are not sent and a very long ror message appears at the bottom of the screen, this is my configuration

<entry key='notificator.types'>web,firebase,sms</entry>
    <entry key='notificator.firebase.serviceAccount'>
            {
                "type": "service_account",
                "project_id": "PROJECT_ID",
                "private_key_id": "PRIVATE_ID",
                "private_key": "PRIVATE_kEY"
            }
    </entry>


    <entry key='notificator.sms.manager.class'>org.traccar.sms.HttpSmsClient</entry>
    <entry key='sms.http.url'>https://www.traccar.org/sms/</entry>
    <entry key='sms.http.authorization'>TOKEN</entry>
    <entry key='sms.http.template'>
    {
        "to": "{phone}",
        "message": "{message}"
    }
</entry>

I use a similar configuration for a server that had a very old version of traccar, but it works without any problems.

If anyone could help me with this question I would greatly appreciate it. I use Traccar Server version 6.5.

I forgot to mention that web and push notifications work perfectly, the problem is with SMS notifications.

pdta: Sorry for my terrible English

I recommend upgrading first. If it still doesn't work, there's probably some issue with the token.