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TEJESWARI TEJUTEJESWARI TEJU 

Field is not writeable: Contact.MailingAddress

VinayVinay (Salesforce Developers) 
Hi Teju,

The MailingAddress is a compound form of the mailing address. Read-only. See Address Compound Fields for details on compound address fields.

Use below fields.
MailingCity
MailingState
MailingCountry
MailingPostalCode

Reference:
https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_contact.htm

Please mark as Best Answer if above information was helpful.

Thanks,
TEJESWARI TEJUTEJESWARI TEJU
Tq..so much
VinayVinay (Salesforce Developers) 
Please mark as Best Answer if above information was helpful.

Thanks,