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This message means that the expression tried to read and display data from the target where the type of the data is not a primitive type (char, short, int etc). For instance, "main" is of type "function pointer" so evaluating "*main" would be asking the debugger to display data of type "function" which doesn't make much sense and would return this error.
At least, that's what it's supposed to mean. If that doesn't make sense in your case, could you attach a small test program with the struct in question and show what evaluations incorrectly return that error message incorrectly?
