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QNAN and non-primitive

I am using Windows 7 (Service Pack 1) , Code Compressor Studio 5.5.0 and Board TMS320C6713 DSK. 

In my interrupt service routine, the function call() class will be called :

And it keeps showing cannot load from non-primitive location. Should I ignore it ? What should I do with this?

Within the function class call(), the output(return value) of call() is y. It shows the values are 1.#QNAN when it is suspended. 

I am not sure both of the problems are related to each other ? 

What should I do?