使用RT-Thread studio编译Vision-Board例程后报错的原因？

使用RT-Thread studio 编译Vision-Board例程后报下面的错误,手册上要求安装的支持包已经安装过了,请问这是什么原因呢

23:54:45 **** Incremental Build of configuration Debug for project vision_board_mipi_7.0inch ****
make -j16 all
arm-none-eabi-gcc "../src/hal_entry.c"
arm-none-eabi-gcc "../rt-thread/src/clock.c"
arm-none-eabi-gcc "../rt-thread/src/components.c"
arm-none-eabi-gcc "../rt-thread/src/idle.c"
arm-none-eabi-gcc "../rt-thread/src/ipc.c"
arm-none-eabi-gcc "../rt-thread/src/irq.c"
d:/software/work/rt-threadstudio/platform/env_released/env/tools/buildtools/2.12-20190422-1053/bin/sh: arm-none-eabi-gcc: not found
d:/software/work/rt-threadstudio/platform/env_released/env/tools/buildtools/2.12-20190422-1053/bin/sh: arm-none-eabi-gcc: not found
make: *** [rt-thread/src/subdir.mk:51: rt-thread/src/clock.o] Error 127
make: *** Waiting for unfinished jobs....
make: *** [src/subdir.mk:18: src/hal_entry.o] Error 127
d:/software/work/rt-threadstudio/platform/env_released/env/tools/buildtools/2.12-20190422-1053/bin/sh: arm-none-eabi-gcc: not found
make: *** [rt-thread/src/subdir.mk:51: rt-thread/src/components.o] Error 127
d:/software/work/rt-threadstudio/platform/env_released/env/tools/buildtools/2.12-20190422-1053/bin/sh: arm-none-eabi-gcc: not found
make: *** [rt-thread/src/subdir.mk:51: rt-thread/src/idle.o] Error 127
d:/software/work/rt-threadstudio/platform/env_released/env/tools/buildtools/2.12-20190422-1053/bin/sh: arm-none-eabi-gcc: not found
make: *** [rt-thread/src/subdir.mk:51: rt-thread/src/ipc.o] Error 127
d:/software/work/rt-threadstudio/platform/env_released/env/tools/buildtools/2.12-20190422-1053/bin/sh: arm-none-eabi-gcc: not found
make: *** [rt-thread/src/subdir.mk:51: rt-thread/src/irq.o] Error 127
Console-Error: 请在 SDK Manager 安装对应的工具链
"make -j16 all" terminated with exit code 2. Build might be incomplete.
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