*** error 65: access violation at 0x0000000C : no 'read' permission in STM32F103RGT6

I am trying to simulate a basic counter using the STM32F103RGT6 chip.

I am getting the following error:

Running with Code Size Limit: 32K
Load "C:\\keilprojects\\gpio\\gpio.AXF"

*** Restricted Version with 32768 Byte Code Size Limit
*** Currently used: 616 Bytes (1%)

*** error 65: access violation at 0x0000000C : no 'read' permission

Any idea why am I getting this error?

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