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I have a csv file with Account records, that I'm trying to upsert with command line dataloader. Specifying external Id field (in my case it's Load_Id__c)

my mapping file doesn't have any other relationship fields.

But I keep getting the MISSING_ARGUMENT error Error message:Load_Id__c not specified

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In order to solve such error you should check very carefully the case of field names in your mapping and configuration files! The case of destination field names must be the same as in the destination org.

In my case I had Load_ID__c instead of Load_Id__c (as in the destination org) in the configuration file.

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