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This sounds like a common issue when importing data!
The error means that the primary key (a unique identifier) in your master file (the main data source) doesn't match the primary key in your detail file (the related data). Essentially, the system can't link the information correctly between the two parts of your data.
To help you get a more precise answer, it would be best if you could upload the csv file
There are several ways to upload a CSV. If you can tell me more about where you're trying to upload it, I might be able to give you specific instructions.