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I am trying to serialize some Sitecore items from the Sitecore instance running in my docker container. So I try this:

dotnet sitecore ser pull 

This works most of the time. But occasionally I get an error like:

System.InvalidOperationException: Serialized version contained a blank language value! 

I am not sure how or why this would be the case. The only way I have found to fix this issue is to delete the item in Sitecore, and then re-create it. Anyone seen this error?

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  • I got the same problem and ended up cleaning the db and re-creating. Did you find any solution?
    – Dan
    Aug 11 at 20:53
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This problem happened to me after modifying the default App Route in a JSS app and deploying it to Sitecore. Trying to serialize the new components and content resulted in this error. I noticed that the App Routes had not only the default "English" language variant, but also an "Invariant" version.

A post from Maarten Willebrands describes the problem and a fix if you are not using Sitecore's Publishing Service.
Sitecore SXA/JSS – Invariant language versions and access denied exceptions

Disabling the FlagPublishingGroupingItems as recommended and rebuilding the database allowed me to again deploy the JSS app with the modified App Route, and successfully serialize the content.

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