Error while installing language pack in MS CRM 4.0?

If you enable language packs after you have removed some out-of-the-box fields (e.g a tab) a language pack will fail. SE is currently working on a hot fix.

Workarounds until hotfix is released;

1. Enable for example Swedish before applying the customizations if possible.

2. Re-import your vanilla backup (Always export out-of-the-box entitys before you start customizing)  

  • Export current customizations
  • Import vanilla export 
  • Enabling your languages
  • Re-import your saved customizations

This worked fine for me and I now have a customized system with many languages.

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