Other Parts Discussed in Thread: SYSCONFIG, , MSP432E401Y
I think this is a bug with using SysConfig in SDK 4.20.00.12 to configure a timer for a MSP432E411Y *_IRQn (e.g. I2C0_IRQn, GPIOA_IRQn, etc.) as the errors point to items that have "already been declared in the current scope" in the ti/devices/msp432e4/inc/msp432e401y.h header file when building. This is seen when adding a single timer configuration with default values.
Using a timer through the TI-Driver library still appears to work if the respective configuration code is added to the project manually.