Enum Rte_Type code generation error

I had enum class and i got error given below when i trigger build process. Enum class includes only uint datatype. In 2019a i didnt have error. I started to get this error when i switch to 2020b release. Even, I couldnt solve this issue with deleting Enum class. How can i solve that?

classdef(Enumeration) EN_STATE < Simulink.IntEnumType
% Enumeration class definition
    enumeration
        STATE_0(0)
        STATE_1(1)
        STATE_2(2)
      
    end
    methods (Static = true)
        function retVal = getDescription()
            retVal = 'Enumerated class definition ENUM';
        end
        function retVal = getHeaderFile()
            retVal = 'Rte_Type.h';
        end
        function retVal = getExportHeaderFile()
            retVal = 'Rte_Type.h';
        end
        function retVal = isImport()
            retVal = true;
        end
        function retVal = getDefaultValue()
            retVal = EN_STATE.STATE_0;
        end
    end
end

Error using coder.internal.callMakeHook

The call to autosar_make_rtw_hook, during the after_tlc hook generated the following error:

Expected true or false not STATE_0

The build process will terminate as a result.

[Brahmadev]

Hi, I am not facing any errors while creating Enumeration members for this class or while calling the methods. Can you provide more information or part of the code that is causing this error?