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error in importing a record



I exported one record using Apex dataloader and saved it in excel. Now, I am triying to import the same record into Salesforce using dataloader, but I am getting following error.


Invalid Session ID found in SesionHeader:Illegal Session, session not found,
missing session key:


Could anyone please let me know how to handle this? Your help is greatly appreciated.

Best Answer chosen by Admin (Salesforce Developers) 

I restarted Apex dataloader and the error got fixed.