Have you ever run into this, very non-descriptive and weird SharePoint error message “Cannot uninstall the LanguagePack 0 because it is not deployed”? You could encounter it while running some PowerShell scripts – most typically, when trying to update a wsp solution.
I have, and luckily often easily solved!
Assume you’re trying to install, update or uninstall a SharePoint solution (.wsp package) using PowerShell-commands Install-SPSolution, Update-SPSolution or Uninstall-SPSolution (respectively). Operation fails with the following (or similar) error:
Error: Cannot uninstall the LanguagePack 0 because it is not deployed
I have actually seen this also in the form of “Cannot uninstall Language Pack 0 because it is not deployed”. However, I think the more relevant form of the error is the one that pops up in the PowerShell. See below for an example!
Error “Update-SPSolution : Cannot uninstall the LanguagePack 0 because it is not deployed.”
In Central Admin the solution is in Error state.
Not really clear, to be honest – most likely, it’s an issue in how SharePoint localizes some of the content types or other declarative artifacts.
You can find quite a lot of solutions online, but they weren’t really working for me. I tried restarting services, removing the package and meddling with the dll-files, but to no avail. However, the actual “last operation details” on the CA page hinted, that the problem was in fact in one of the features. The feature in question included some content types, and toying around with them is like playing baseball with hand grenades, so you have to tread carefully in cases like these.