IAR EWARM软件关键字u8报错？

weiyanda-324311

Error[Pe020]: identifier "u8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 29
Error[Pe020]: identifier "u8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 30
Error[Pe020]: identifier "u8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 31
Error[Pe020]: identifier "u8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 32
Error[Pe020]: identifier "u8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 33
Error[Pe020]: identifier "s8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 90
Error[Pe020]: identifier "u8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 92
Error[Pe020]: identifier "s8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 111
Error[Pe020]: identifier "u8" is undefined D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 112
Warning[Pe223]: function "halGpioSet" declared implicitly D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 136
Warning[Pe223]: function "halGpioSet" declared implicitly D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 163
Warning[Pe223]: function "halGpioSet" declared implicitly D:\program\MAC\STM32W108\iap_bootloader\bl_user.c 179
Error while running C/C++ Compiler
 
大家好，如上所述，请问为什么u8关键字都会报错的，该怎么改？

weiyanda-324311

没有人知道原因吗？