Kmail - fatal error!

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I had same issue, but with collection “trash” and other resourceID (5), but I solved it without to delete a lot of files. I followed these steps (assisted by DuckDuckGo’s AI chat; GPT4o-mini):

  • Open akonadiconsole (it will probably be necessary to install it)
  • In the “DB Explorer” tab (the fifth tab…I don’t know its name/label in English because I have my GUI in Spanish), select the table resourcetable and check for the resource with id reported in the error dialog (in my case, the resourceId “5”; in the case of @PedroSMS , it should be “14”). I did this to figure out what resource had the issue; it were akonadi_maildir_resource_0, that is my “Local folders” resource.
  • Then, select the table collectiontable and look up for records with resourceId = 5, just to verify that resource had a related collection named “trash”
  • Finally, in the tab Explorer or Collections (the second tab) look up for “trash” collection/folder of the affected resource (in my case “Local folders”) and delete it
  • It’s done: try again to open Kmail. The deleted collection will be re-created

Deleting the collection:
image

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