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please see here: How to fix Lightroom launch error 'Could not call C function: private_load_AgCoreTech'. (adobe.com)
If this doesn't help we need more information about your environment.
Which version of Lightroom do you use?
Which operating system do you use?
Please post the exact versaion and not only phrases like 'latest', 'recent' and so on.
Has Lightroom worked in the past? If yes, what has been changed on you system before the error occur?