I usually just create a new company from scratch because sometimes you get errors like that. It's quite frustrating when preparing some demo data and samples for testing.
You can create a new company from the Companies page:
Select Contoso Sample Data:
Select the relevant modules (if you get errors doing this just select all to start):
If that doesn't work you may need to manually go through the errors such as creating an Item Journal batch with that name. I find sometimes I need a completely new fresh environment with nothing in it in order to get that Contoso data loaded.
And if all else fails I sometimes just make a copy of the standard CRONUS demo company that comes in most environments. It has mostly all the functionality from the Contoso data set.
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