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What you have done is declared a list of Offer__c but your are trying to add list rather than the object(offer__c).
You need to use something like below, if you want to add list to a list
List<List<Offer__c>> lstOffer.addall
What you have done is declared a list of Offer__c but your are trying to add list rather than the object(offer__c).
You need to use something like below, if you want to add list to a list
List<List<Offer__c>> lstOffer.
What you have done is declared a list of Offer__c but your are trying to add list rather than the object(offer__c).
You need to use something like below, if you want to add list to a list
What you have done is declared a list of Offer__c but your are trying to add list rather than the object(offer__c).
You need to use something like below, if you want to add list to a list
