We had the same data type (at least as per us) on both sides of the assignment operator, a standard account record being assigned to a standard account variable. To us, we had not violated any of the assignment rules but were still encountering this strange error message. Our code looked somewhat like the following:
Digging deeper, we realized that the Salesforce Org already had a custom class by the name “Account” and this was conflicting with the standard controller of “Account” provided by the platform. This was the cause of our error. Our custom class was confusing the compiler as to which class object to create and which one to refer. We renamed the custom class and the dependencies for the class; and our code started to work fine.
As a matter of fact, the salesforce platform allows you to create the custom class with the same name as any standard controller, but when you try to use the standard controller it cannot differentiate between the two classes and hence throws the error. So to avoid any such issues, we strongly recommend that one should not name the custom controllers with any of the existing standard object API names.
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