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Stefaan Somers 12Stefaan Somers 12 

DataLoader Invalid field mapping for Long Text Area

I have a DataLoader-job that is already running successfully for some years. Since a few weeks, I see in the logging 'Field mapping is invalid'.

The source is a query to a SQL table, where the concerned column is VARCHAR(1000)

The destination is Salesforce where the field is a Long Text Area.

The version of DataLoader is v38. There is nothing changed in destination or source, so no clue what may be causing the issue and I'm breaking my head for years now.

Any help for troubleshooting would be most welcome.
VinayVinay (Salesforce Developers) 
Hi Stefaan,

Below are few points which can be checked.

>> Visible to the profile being used by the user signed in to the Data Loader check the field level security.
>> If it worked in any other org check differences between profiles and field-level security. 
>> Field might have been deleted.
>> Spelled correctly in the .sdl fil

Thanks,
Vinay Kumar