Crash in Debug then Keil can't find device connected

I wrote a piece of assembly code to use a button on my CORTEX-M4F board and went into Debug mode. When I ran the code the whole thing crashed, some error messages came up which I had never seen before...
Crash in Debug then Keil can't find device connected

I wrote a piece of assembly code to use a button on my CORTEX-M4F board and went into Debug mode. When I ran the code the whole thing crashed, some error messages came up which I had never seen before...
can't find any device after installing the package

i have a board nucleo-L452RE-p i installed the package keil.STM32L4xx_DFP.2.3.0 on my keil MDK, i have also installed the STM32CubeL4 package from ST's website. but when i try to start a new project,...
can't find any device after installing the package

i have a board nucleo-L452RE-p i installed the package keil.STM32L4xx_DFP.2.3.0 on my keil MDK, i have also installed the STM32CubeL4 package from ST's website. but when i try to start a new project,...
Error Compiling project - can't find header file

I am getting the following error upon compiling a simple project for STM32F407VG on MDK version 5 for the Discovery Board. All packs are installed fine. Please note, the header file is all uppercase...