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For earlier versions than PlanSwift PlanSwift 10.2, please contact PlanSwift Technical Support at 888-752-6794 Ext. 2.
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If the error is the main data file in the job (you can tell since the address has only the job name), you can learn how to bring the job back from this link:
Error: What To Do If PlanSwift Corrupts A Main Data File In A Job
If it is in a Takeoff or Page folder, then you will just need to cut out the folder. Unfortunately, there is not a way to bring back this data.