error - NullPointerException

2022-07-27 13:58:08  INFO: [Tde3c3a89] error - NullPointerException (NotificationManager:55 < *:88 < *:125 < ConnectionManager:108 < BaseProtocolDecoder:242 < ...)
2022-07-27 13:58:08  INFO: [Tde3c3a89] disconnected

hello dear support ...! I just remove a user phone from modern GUI and after a few minutes all devices were down and now I see logs I got this it's log repeat a lot of time

Doesn't looks like you're using the latest official version.

Yes..! it's the latest official we have new install before 6 to 7 day and everything is working fine but today we face this issue

Well, the line numbers don't match. Are you sure you haven't changed the code?

2022-07-27 14:19:35  INFO: HikariPool-1 - Starting...
2022-07-27 14:19:35  WARN: Registered driver with driverClassName=com.mysql.jdbc.Driver was not found, trying direct instantiation.
2022-07-27 14:19:36  INFO: HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@3e7dd664
2022-07-27 14:19:36  INFO: HikariPool-1 - Start completed.
2022-07-27 14:19:36  INFO: Clearing database change log checksums
2022-07-27 14:19:37  INFO: Successfully acquired change log lock
2022-07-27 14:19:38  INFO: Successfully released change log lock
2022-07-27 14:19:38  INFO: Successfully acquired change log lock
2022-07-27 14:19:38  INFO: Cannot load service: liquibase.parser.ChangeLogParser: liquibase.parser.core.json.JsonChangeLogParser Unable to get public no-arg constructor
2022-07-27 14:19:38  INFO: Cannot load service: liquibase.parser.ChangeLogParser: liquibase.parser.core.yaml.YamlChangeLogParser Unable to get public no-arg constructor
2022-07-27 14:19:40  INFO: Reading from traccar.DATABASECHANGELOG
2022-07-27 14:19:41  INFO: Reading from traccar.DATABASECHANGELOG
2022-07-27 14:19:41  INFO: Cannot load service: liquibase.hub.HubService: Provider liquibase.hub.core.StandardHubService could not be instantiated
2022-07-27 14:19:41  INFO: Successfully released change log lock
2022-07-27 14:19:43  INFO: Your platform does not provide complete low-level API for accessing direct buffers reliably. Unless explicitly requested, heap buffer will always be preferred to avoid potential system instability.
2022-07-27 14:19:44  INFO: Operating system name: Linux version: 5.4.0-122-generic architecture: amd64
2022-07-27 14:19:44  INFO: Java runtime name: OpenJDK 64-Bit Server VM vendor: ojdkbuild version: 11.0.13+8-LTS
2022-07-27 14:19:44  INFO: Memory limit heap: 237mb non-heap: 0mb
2022-07-27 14:19:44  INFO: Character encoding: UTF-8 charset: UTF-8
2022-07-27 14:19:44  INFO: Version: 5.0
2022-07-27 14:19:44  INFO: Starting server...
2022-07-27 14:19:44  INFO: jetty-10.0.7; built: 2021-10-06T19:34:02.766Z; git: da8a4553af9dd84080931fa0f8c678cd2d60f3d9; jvm 11.0.13+8-LTS
2022-07-27 14:19:45  INFO: Started o.t.w.@5a39e554{/,null,AVAILABLE}
2022-07-27 14:19:45  INFO: Session workerName=node0
2022-07-27 14:19:46  WARN: JAXBContext implementation could not be found. WADL feature is disabled.
2022-07-27 14:19:47  INFO: Started o.e.j.s.ServletContextHandler@6fefc5ea{/,null,AVAILABLE}
2022-07-27 14:19:47  INFO: Started ServerConnector@2630dbc4{HTTP/1.1, (http/1.1)}{0.0.0.0:8082}
2022-07-27 14:19:47  INFO: Started Server@25a290ee{STARTING}[10.0.7,sto=0] @12784ms
2022-07-27 14:19:47  INFO: Health check enabled with period 480000
2022-07-27 14:19:56  INFO: [T40aa94d2] connected
2022-07-27 14:19:56  INFO: [T40aa94d2: gt06 < 119.160.96.153] 78780d0108680030350142860011429c0d0a
2022-07-27 14:19:56  INFO: [T40aa94d2: gt06 > 119.160.96.153] 787805010011c95d0d0a
2022-07-27 14:19:56  INFO: [T40aa94d2] error - NullPointerException (NotificationManager:55 < *:88 < *:125 < ConnectionManager:108 < BaseProtocolDecoder:242 < ...)
2022-07-27 14:19:56  INFO: [T40aa94d2] disconnected
2022-07-27 14:19:56  INFO: [T40aa94d2] error - NullPointerException (NotificationManager:55 < *:88 < *:125 < ConnectionManager:108 < *:67 < MainEventHandler:131 < ...)

complate starting logs

no, sir, we have not to change anything in the code we just touch it a few times traccar.xml and which right now look like this

  GNU nano 4.8                                                                                        /opt/traccar/conf/traccar.xml                                                                                                   
<?xml version='1.0' encoding='UTF-8'?>

<!DOCTYPE properties SYSTEM 'http://java.sun.com/dtd/properties.dtd'>

<properties>

    <entry key="config.default">./conf/default.xml</entry>

        <entry key='notificator.types'>web,mail,sms</entry>
        <entry key='notificator.sms.manager.class'>org.traccar.sms.HttpSmsClient</entry>
        <entry key='sms.http.url'>https://esmsapi.com/api/send/whatsapp</entry>
        <entry key='sms.http.template'>
                secret=dummy&amp;account=2&amp;phone={phone}&amp;message={message}
        </entry>

    <entry key='database.driver'>com.mysql.jdbc.Driver</entry>
    <entry key='database.url'>jdbc:mysql://dummy/dummy?serverTimezone=UTC&amp;useSSL=false&amp;allowMultiQueries=true&amp;autoReconnect=true&amp;useUnicode=yes&amp;characterEncoding=UTF-8&amp;sessionVariables=sql_mode=''</e>
    <entry key='database.user'>dummy</entry>
    <entry key='database.password'>dummy</entry>

</properties>

Version: 5.0

Yes..! it's the latest official

Just for your information, we had 2 releases after 5.0, so you clearly provided false information.

Sorry sir it's my mistake I have install it from already downloading files let me install the new one

and really Thanks for your great and fast support..! I have no important data so I can fresh install the new version please close this thread