STM32CubeIDE ver1.19.0 ERROR on GUI but Generated code have no error.

[BAS-BLEU]

I am using STM32F103C8T6 MCU and STM32CubeIDE ver 19.0.0. When i enabled PA8- PWM generation Channel 1 i get warning RCC Mode and Configuration Tab: Master Clock Output as a error/warning. I have reset state the PA8 pin again enabled as TIM1_CH1 and Tim1 setting Channel 1 : PWM generation CH1 again same error/warning i have get. when generated code closly monitored i didnot find and MCO related code in main.c. What to do? should i ignore cubeMX warning/error and relay on generated code? 

[TDK]

Hover over the red box to find out why it's there. It will tell you that the pin used by MCO is being used for something else and therefore MCO cannot be activated.

The display is confusing, but this is just informational. There is no error to correct. Continue on.

[KnarfB]

That's not an error, but a conflict because you are using pin PA8 already for another purpose. If you hover the mouse over the red item, you will get an explanation. Similiar for the exclamation mark next to RCC: yellow == partial conflict == not every feature of the resource is available (again: MCO).

hth

KnarfB