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Paola VidalPaola Vidal 

Data Loader Mass Delete Question

When using the Data Loader to try and mass delete 1,200 contacts, I'm getting an "Invalid Record ID" for every single record, but the input csv file only has the ID for the contact which I have mapped.  Does anyone know why I would be getting this error and how to overcome it?
Shikha AgashiShikha Agashi
are you logged in right Org to delete contact?
Paola VidalPaola Vidal
How would I know what Organization I'm in?  I simply log in, am the administrator, why does the Org Id matter and where do I find that?
 
Shikha AgashiShikha Agashi
I mean if you have extracted ID from Sandbox, DEV then are you logged in DEV enviornment from Data Loader. because as error as is saying Invalid record ID. 

Also make sure, if you are in right Sandbox, then you have mapped file to correct object? Just want to verify: your contact record id are starting with:003