# Error starting navigator

**URL:** <https://forum.canton.network/t/error-starting-navigator/916>\
**Category:** App Development\
**Created:** [July 27, 2020, 8:27am UTC](https://forum.canton.network/t/error-starting-navigator/916 "2020-07-27T08:27:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![arton.berisha](https://avatars.discourse-cdn.com/v4/letter/a/ecae2f/32.png) [@arton.berisha](https://forum.canton.network/u/arton.berisha)\
**Post date:** [July 27, 2020, 8:27am UTC](https://forum.canton.network/t/error-starting-navigator/916/1 "2020-07-27T08:27:50Z")

</div>

hello, i have a problem with the navigator.

I have one DAR that should be tested in the Sandbox environment. I started the sandbox with the following command:

`java -jar daml-sdk.jar sandbox myDar-0.0.1.dar --ledgerid=myLedgerId --sql-backend-jdbcurl "jdbc:postgresql://localhost/postgres?user=postgres&password=mypassword"`

The sandbox is started and looks good:

```
15:48:36.608 [pool-1-thread-3] INFO c.d.p.apiserver.LedgerApiServer - **Listening on localhost:6865 over plain text.**

15:48:36.609 [pool-1-thread-4] INFO c.d.p.apiserver.StandaloneApiServer - Initialized API server version 1.3.0 with ledger-id = myLedgerId, port = 6865, dar file = List(myDar-0.0.1.dar)

```

now i start the navigator with the command:

`java -jar daml-sdk.jar navigator server --config-file ui-backend.conf`

the content of the ui-backend.conf looks like this:

```
users {
            ccc { party = "ccc" }
            ppp { party = "ppp" }
            iii { party = "iii" }
            coo { party = "coo" }
            fff { party = "fff" }
            admin { party = "admin" }
            ooo { party = "ooo" }
        }

```

starting the navigator i get the following exception:

```
17:15:53.716 [main] INFO com.daml.navigator.config.Config$ - Loading Navigator config file from ui-backend.conf
17:15:54.930 [main] ERROR user-facing-logs - Configuration file could not be parsed: ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,4)),users.iii.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,3)),users.ppp.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,5)),users.coo.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,7)),users.admin.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,6)),users.fff.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,8)),users.ooo.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,2)),users.ccc.party)
Exception in thread "main" java.lang.RuntimeException: ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,4)),users.iii.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,3)),users.ppp.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,5)),users.coo.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,7)),users.admin.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,6)),users.fff.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,8)),users.ooo.party), ThrowableFailure(java.sql.SQLException: Error opening connection,Some(ConfigValueLocation(file:/tmp/my_project/ui-backend.conf,2)),users.ccc.party)
        at scala.sys.package$.error(package.scala:30)
        at com.daml.navigator.UIBackend.run(UIBackend.scala:309)
        at com.daml.navigator.UIBackend.$anonfun$main$1(UIBackend.scala:282)
        at com.daml.navigator.UIBackend.$anonfun$main$1$adapted(UIBackend.scala:282)
        at com.daml.navigator.UIBackend$$Lambda$128/00000000B899FB80.apply(Unknown Source)
        at scala.Option.foreach(Option.scala:407)
        at com.daml.navigator.UIBackend.main(UIBackend.scala:282)
        at com.daml.sdk.SdkMain$.main(SdkMain.scala:28)
        at com.daml.sdk.SdkMain.main(SdkMain.scala)

```

Environment-Details:

- PostgreSQL 12.1
- Java 1.8.0\_251 (JRE 1.8.0 Linux s390x-64-Bit)
- Daml SDK 1.3.0

thanks in advance for the help!

---

<div class="post-metadata">

**Author:** ![Robert\_Autenrieth](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/robert_autenrieth/32/153_2.png) [@Robert\_Autenrieth](https://forum.canton.network/u/Robert_Autenrieth)\
**Post date:** [July 27, 2020, 11:58am UTC](https://forum.canton.network/t/error-starting-navigator/916/2 "2020-07-27T11:58:42Z")

</div>

Hi Arton!

I could not reproduce the error locally, but I think I know what is happening: it looks like you are running Linux on IBM Z, and Navigator currently does not work on that system.

* * *

### Technical details:

The Navigator error “`Configuration file could not be parsed`” happens before Navigator tries to connect to the ledger. It should therefore have nothing to do with your sandbox setup.

As part of the config parsing, Navigator creates a SQLite in-memory database for each party listed in the config. We use the [sqlite-jdbc](https://github.com/xerial/sqlite-jdbc) library for SQLite, which includes native SQLite binaries for all major operating systems. Unfortunately, it looks like Linux on IBM Z is [not included](https://github.com/xerial/sqlite-jdbc/tree/master/src/main/resources/org/sqlite/native).

I’ll open an issue for fixing this, but I can’t comment on the priority of the fix.

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<div class="post-metadata">

**Author:** ![arton.berisha](https://avatars.discourse-cdn.com/v4/letter/a/ecae2f/32.png) [@arton.berisha](https://forum.canton.network/u/arton.berisha)\
**Post date:** [July 27, 2020, 12:44pm UTC](https://forum.canton.network/t/error-starting-navigator/916/3 "2020-07-27T12:44:27Z")

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Hi Robert,

thx a lot for the Information.

Greetings, Arton

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<div class="post-metadata">

**Author:** ![andreolf](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/andreolf/32/491_2.png) [@andreolf](https://forum.canton.network/u/andreolf)\
**Post date:** [July 27, 2020, 1:13pm UTC](https://forum.canton.network/t/error-starting-navigator/916/4 "2020-07-27T13:13:55Z")

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Welcome @arton.berisha btw in the forum!