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Unable to Open Manage Run-Time Environment

Hi all, 

I am trying to open Manage Run-Time Environment to setup STDERR, STDIN and STDOUT so that I can use "printf" to output data values for debug purposes.

However, the Manage Run-Time Environment button has greyed out and I couldn't access into it. (Please see image attached)

I have been looking up lots of articles and I couldn't find any solution to it.

Below is my Keil Version specification.

I am really appreciate if anyone can help me here.

Thank you all very much.