Frequency value undefined


I have started with STM32CubeMx that generates code in Keil IDE. I have well entered the value of the frequency which is supposed to be 64. But when I get into the options for the target the tab concerned shows that the value is undefined (Please find the screen attached). How can I fix it?
Thanks in advance.

If you are debugging on hardware then this value is not important at all. You can ignore it. This value is only used for the PC Simulation.

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Okay Thank you Dear @Prototype

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