usync import error object reference not set to an instance of an object - Extending Umbraco and using the API

Mike Poole 53 posts 165 karma points

Mar 04, 2019 @ 11:25

uSync import error - Object reference not set to an instance of an object

We are currently using uSync but now have an environment where we get this below error in the logs when attempting an import

My question is - how can I trace WHICH element is causing this issue during the import? The debugging does not show which element is being processed when the error occurs

Many thanks

2019-03-04 11:09:34,497 [P1716/D7/T160] ERROR Jumoo.uSync.BackOffice.Controllers.uSyncApiController - Unhandled controller exception occurred System.NullReferenceException: Object reference not set to an instance of an object. at Jumoo.uSync.Core.Serializers.ContentTypeBaseSerializer1.DeserializeBase(IContentTypeBase item, XElement info) at Jumoo.uSync.Core.Serializers.ContentTypeSerializer.DeserializeCore(XElement node) at Jumoo.uSync.Core.Serializers.SyncBaseSerializer1.DeSerialize(XElement node, Boolean forceUpdate) at Jumoo.uSync.BackOffice.Handlers.ContentTypeHandler.Import(String filePath, Boolean force) at Jumoo.uSync.BackOffice.Handlers.uSyncBaseHandler1.ImportFolder(String folder, Boolean force, Dictionary2 updates) at Jumoo.uSync.BackOffice.Handlers.uSyncBaseHandler1.ImportFolder(String folder, Boolean force, Dictionary2 updates) at Jumoo.uSync.BackOffice.Handlers.uSyncBaseHandler1.ImportFolder(String folder, Boolean force, Dictionary2 updates) at Jumoo.uSync.BackOffice.Handlers.uSyncBaseHandler1.ImportFolder(String folder, Boolean force, Dictionary2 updates) at Jumoo.uSync.BackOffice.Handlers.uSyncBaseHandler1.ImportAll(String folder, Boolean force) at Jumoo.uSync.BackOffice.uSyncBackOfficeContext.Import(IEnumerable1 syncHandlers, String folder, Boolean checkConfig, Boolean force, String groupName) at Jumoo.uSync.BackOffice.uSyncBackOfficeContext.Import(String groupName, String folder, Boolean force) at Jumoo.uSync.BackOffice.uSyncBackOfficeContext.ImportAll(String folder, Boolean force) at Jumoo.uSync.BackOffice.Controllers.uSyncApiController.Import(Boolean force)

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Chris Evans 137 posts 353 karma points c-trib

Mar 04, 2019 @ 19:56

Is anything being saved in ~/app_data/temp/usync ? Might be some logs there showing the issue.

Also according to this post:

https://our.umbraco.com/packages/developer-tools/usync/usync/80228-is-it-possible-to-see-more-verbose-information#comment-256419

it might be possible to get more information in the standard umbraco trace log by configuring log4net to log usync more verbosely.

Hope that helps,

Chris

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Kevin Jump 2342 posts 14889 karma points MVP 8x c-trib

Mar 05, 2019 @ 10:53

Hi

if you up the logging level for uSync (in the log4net.config file add :

  <logger name="Jumoo.uSync">
    <level value="DEBUG" />
  </logger>

then you should see lots of logging, but more importantly what is happening when the error is thrown.

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Mike Poole 53 posts 165 karma points

Mar 07, 2019 @ 07:41

Thanks Kevin, really appreciate it

I set the logger value to DEBUG and get this at the point it errors

I am assuming it is failing on the deletion of a DocumentType? How can I tell which is the offending element?

Mike

2019-03-07 05:24:31,007 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Running Import: DocumentType 2019-03-07 05:24:31,007 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:25:21,746 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:25:21,750 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:25:21,753 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:25:21,759 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:25:21,762 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:25:21,767 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:25:21,774 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:25:21,777 [P7952/D2/T137] INFO Jumoo.uSync.BackOffice.Logging - Processing a Delete: Umbraco.Core.Models.IContentType 2019-03-07 05:26:38,157 [P7952/D2/T137] ERROR Jumoo.uSync.BackOffice.Controllers.uSyncApiController - Unhandled controller exception occurred System.NullReferenceException: Object reference not set to an instance of an object. at Jumoo.uSync.Core.Serializers.ContentTypeBaseSerializer1.DeserializeBase(IContentTypeBase item, XElement info) at Jumoo.uSync.Core.Serializers.ContentTypeSerializer.DeserializeCore(XElement node) at Jumoo.uSync.Core.Serializers.SyncBaseSerializer1.DeSerialize(XElement node, Boolean forceUpdate)

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Kevin Jump 2342 posts 14889 karma points MVP 8x c-trib

Mar 07, 2019 @ 08:19

Hi Mike,

I actually think the error is with the very first item it is trying to process, the delete actions don't serialize - they just look for the key and if it's there delete it.

That the error is then in the serializers makes me think there is something wrong with the first file (or indeed something bigger that is hit as soon as it tries to read the file).

I've had a look through the code, and I think one possibility is that the master content item is missing - as it does look like we have missed a null check on that - so a workaround might be to delete the Key value from the <master> element in the file (it will look something like this just remove the key="" element)

<Master Key="5e0a25c0-fd3c-4d00-bf12-4fd7cd4aa3f8">myMasterItem</Master>

this is a bit of a long shot, as in theory, you should never get to an import of an item where the master hasn't been created first as the imports are done based on the folder structure

I suppose it's possible the folder could be missing the master file - then I would recommend a full export to see if it fixes things.

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uSync import error - Object reference not set to an instance of an object