Keil编译出现如下错误，网上找不到解决办法，请求大佬帮助

晓枫、残月 · 2018-6-27 17:45

*** Using Compiler 'V5.06 update 5 (build 528)', folder: 'H:\MDK5\ARM\ARMCC\Bin'
Build target '多彩流水灯'
assembling startup_stm32f429_439xx.s...
startup_stm32f429_439xx.s: Error: A9511E: Unable to determine the current toolkit. Check that ARM_TOOL_VARIANT is set correctly.
startup_stm32f429_439xx.s: Check that your license details are correct in the License Management dialog of MDK. Additional information is available at:
startup_stm32f429_439xx.s:  http://www.keil.com/support/man/docs/license/license_management.htm
startup_stm32f429_439xx.s:  If you need further help, provide this complete error report to your supplier or license.support@arm.com.
startup_stm32f429_439xx.s:  - ARMLMD_LICENSE_FILE: unset
startup_stm32f429_439xx.s:  - LM_LICENSE_FILE: unset
startup_stm32f429_439xx.s:  - ARM_TOOL_VARIANT: unset
startup_stm32f429_439xx.s:  - ARM_PRODUCT_PATH: unset
startup_stm32f429_439xx.s:  - Product location: product not found
startup_stm32f429_439xx.s:  - Toolchain location: H:\MDK5\ARM\ARMCC\Bin
startup_stm32f429_439xx.s:  - Selected tool variant: mdk_cm_pro
startup_stm32f429_439xx.s: Product: unknown
startup_stm32f429_439xx.s: Component: ARM Compiler 5.06 update 5 (build 528)
startup_stm32f429_439xx.s: Tool: ArmAsm [4d35e1]
compiling system_stm32f4xx.c...
Error: C9511E: Unable to determine the current toolkit. Check that ARM_TOOL_VARIANT is set correctly.
Check that your license details are correct in the License Management dialog of MDK. Additional information is available at:
http://www.keil.com/support/man/docs/license/license_management.htm
If you need further help, provide this complete error report to your supplier or license.support@arm.com.
- ARMLMD_LICENSE_FILE: unset
- LM_LICENSE_FILE: unset
- ARM_TOOL_VARIANT: unset
- ARM_PRODUCT_PATH: unset
- Product location: product not found
- Toolchain location: H:\MDK5\ARM\ARMCC\Bin
- Selected tool variant: mdk_cm_pro
Product: unknown
Component: ARM Compiler 5.06 update 5 (build 528)
Tool: ArmCC [4d3621]
compiling misc.c...
Error: C9511E: Unable to determine the current toolkit. Check that ARM_TOOL_VARIANT is set correctly.
Check that your license details are correct in the License Management dialog of MDK. Additional information is available at: