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link to relevant sections in manual.
Then, you need to run the following tools from the menu {{man menu|Tools -> Family Tree Repair}} in the listed order:
# {{man menu|[[Gramps_4.1_Wiki_Manual_-_Tools#Check_and_Repair_Database|Check and Repair Database]]}}# {{man menu|[[Gramps_4.1_Wiki_Manual_-_Tools#Rebuild_Reference_Maps|Rebuild Reference Maps]]}}# {{man menu|[[Gramps_4.1_Wiki_Manual_-_Tools#Rebuild_Secondary_Indexes|Rebuild Secondary Indices]]}}
If you still get the error after running the repair tools, then you should try creating a new family tree, and importing your backup. If errors still occur, try running the above tools on the re-imported tree.
