Issue in using "HAL_UART_Transmit" in FreeRTOS-MPU Usermode task

I am using FreeRTOS-MPU port with STM32F412. I have taken example which is given in STM32CubeF4 sdk package (STM32Cube FW_F4 V1.24.1\Projects\STM32F412G-Discovery\Applications\FreeRTOS\FreeRTOS_MPU).

All things are working fine but I am not able to figure out that how to use "HAL_UART_Transmit" in FreeRTOS Usermode (Non- Priviledge) task. Currently it gives memory fault if I call this API inside the Use mode task. However this API is working fine if the task is in Privilege mode.