As you can see in your error message, it is said that e.g. a column "C_NAME" is not found, because it is called "C_Name". This is because all column names are converted to uppercase names in case they are not enclosed in quotes (so "C_NAME" <> "C_Name").
So please enclose your column names in quotes (e.g. c."C_Name").
Regards,
Florian