Can’t delete mail in my Trash folder in Evolution mail, get error “Summary and Folder mismatch”

• First create a backup of your mail using Evolution by clicking on File->Backup Settings “This step is vitally important to prevent data loss”
• By using your file browser browse to the following directory/home/YOURUSERNAME/.evolution/mail/local
• Once in the local folder delete all files with the following extensions.
  .index
  .cmeta
  .ev-summary

  Very important to not delete the files with the .data extension

• Restart Evolution
• Evolution will now attempt to re-create all indexes
• You should be able to delete the mails in the trash folder