Studio 2014 Error Message: Value cannot be null. Parameter name: rootContainer
Thread poster: Fiona Busfield

Fiona Busfield  Identity Verified
United Kingdom
Member (2002)
French to English
+ ...
May 1, 2015

Hi all,
Can anyone shed any light on this error message I'm getting in Studio please?
My client sent me a package which I duly opened and began working on. So far so good. The word counts were off (showing minus figures) so I performed a Word Count batch task to try and correct them. After doing that I was unable to reopen the files getting the above error message. "Value cannot be null. Parameter name: rootContainer"
I was trying to open multiple files so I tried opening each one separately, same message.
I tried opening files from other projects and they open fine, no error message at all.
I was unable to open the xliffs at all. I then reopened the package and began working again with the files opening fine and the previously translated content still in the TM.
I then made a change to some add-in settings that required a Studio restart to take effect. After restarting I had the same problem and error message with these files. I am still able to open files from other projects.
After reloading the package and starting from scratch again 3 times, I wondered if there was a problem with the project package so I created a new project using the source files from the original one. Again, everything worked fine until I started translating them, closed them down and then tried to reopen them. Interestingly, they reopened several times fine before I translated any of the content when I tested.
This is a fairly sizeable project so I really don't want to be starting from scratch every time I open the files. I've searched and searched but I can't find any info about this error.
Not sure if this is helpful but the detailed error results read as follows:


Value cannot be null. Parameter name: rootContainer


System.ArgumentNullException, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089





b__8(ISdlXliffStreamContentHandler handler) at System.Collections.Generic.List`1.ForEach(Action`1 action) at Sdl.FileTypeSupport.Bilingual.SdlXliff.SdlXliffFeeder.ContinueScanning() at Sdl.FileTypeSupport.Bilingual.SdlXliff.XliffFileReader.ContinueParsing() at Sdl.FileTypeSupport.Bilingual.SdlXliff.XliffFileReader.ParseNext() at Sdl.FileTypeSupport.Framework.Integration.FileExtractor.ParseNext() at Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.ParseNext() at Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.Parse() at Sdl.TranslationStudio.Editor.TranslationEditor.TranslatableDocument.Load(IJobExecutionContext context) at Sdl.Desktop.Platform.Services.JobRequest.Execute(IJobExecutionContext context) at Sdl.Desktop.Platform.Implementation.Services.Job.b__3() at Sdl.Desktop.Platform.Implementation.Services.Log.Resources(Object message, Action action) at Sdl.Desktop.Platform.Implementation.Services.Job._worker_DoWork(Object sender, DoWorkEventArgs e) at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e) at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)]]>


SDL Trados Studio


Microsoft Windows 8.1




OFFICEPC\Fiona Busfield




8338376 MB

Any help or insight would be greatly appreciated.
Thanks in advance.


Local time: 19:45
Value cannot be null May 5, 2015

Hello Fiona,

This is Guillaume from SDL.

There is an article in our Knowledge Base about this error message:

If you need further assistance, please do not hesitate to contact us via Live Chat ( )

Kind regards,



Fiona Busfield  Identity Verified
United Kingdom
Member (2002)
French to English
+ ...
Different error? May 5, 2015

Hi Guillaume,
Many thanks for your reply. The Knowledge Base article you referred me to seems to deal with a different error however (Value cannot be null. Parameter name: setup.LanguageDirection.TargetCulture).
The parameter in the error message here is RootContainer. The target language is showing correctly as per the article you suggested.

I am still at a loss!
Thanks anyway, it's looking like I'll just have to muddle through as I am. No word from my client on this either.



Asset Orymbayev  Identity Verified
Local time: 01:45
English to Kazakh
+ ...
How did yu solve this problem? May 23, 2017


How did you solve this problem?


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Studio 2014 Error Message: Value cannot be null. Parameter name: rootContainer

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