ARM_TOOL_VARIANT unset

I met some questions when unsing Arm ds-5 to compiler the existing sve examples in Windows,it shows armv8-a+sve not support. How to solve it.

armclang -g -O1 -fvectorize -MD --target=aarch64-arm-none-eabi -march=armv8-a+sve -c -o fma.o fma.c
armclang.exe: error: ARMv8a is not available with the current toolkit and license. Check that ARM_TOOL_VARIANT is set correctly.
Information about this error is available at: ds.arm.com/.../lic81
General licensing information is available at: ds.arm.com/.../
If you need further help, provide this complete error report to your supplier or license.support@arm.com.
- ARMLMD_LICENSE_FILE: 'C:\Users\di.liang\AppData\Roaming\ARM\DS-5\licenses'
- LM_LICENSE_FILE: '27000@172.16.64.89;7010@172.16.0.138'
- ARM_TOOL_VARIANT: unset
- ARM_PRODUCT_PATH: 'C:\Program Files\DS-5 v5.29.1\sw\mappings'
- Product location: C:\Program Files\DS-5 v5.29.1\sw\mappings
- Toolchain location: C:\Program Files\DS-5 v5.29.1\sw\ARMCompiler6.10.1\lib\tt_sve\bin
- Selected tool variant: product
Product: DS-5 Professional 5.29.1
Component: ARM Compiler 6.10.1
Tool: armclang [5ced1200]

armclang.exe: error: ARM Compiler does not support '-march=armv8-a+sve'
make: *** [<builtin>: fma.o] Error 1