illegal assignment from list aggregateresult to list opportunity

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1. Salesforce: Illegal assignment from list to list for custom class and

   

2. apex

   

3. Salesforce: Illegal assignment from List＜AggregateResult＞ to List

   

4. Salesforce: Illegal assignment from list to list (OpportunityContactRole to String) (2 Solutions!!)

   

5. Salesforce: Illegal assignment from object to string Aggregate Result

   

6. Salesforce: Getting error with Enterprise API: Illegal assignment from