Startup.s: Error: A9580E: ARM7 is not available with the current toolkit and license. Check that ARM_TOOL_VARIANT is set correctly.

Build started: Project: first
*** Using Compiler 'V5.06 update 6 (build 750)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'
Build target 'Target 1'
assembling Startup.s...
Startup.s: Error: A9580E: ARM7 is not available with the current toolkit and license. Check that ARM_TOOL_VARIANT is set correctly.
Startup.s: Check that your license details are correct in the License Management dialog of MDK. Additional information is available at:
Startup.s: www.keil.com/.../license_management.htm
Startup.s: If you need further help, provide this complete error report to your supplier or license.support@arm.com.
Startup.s: - ARMLMD_LICENSE_FILE: unset
Startup.s: - LM_LICENSE_FILE: unset
Startup.s: - ARM_TOOL_VARIANT: unset
Startup.s: - ARM_PRODUCT_PATH: unset
Startup.s: - Product location: C:\Keil_v5\ARM\sw\mappings
Startup.s: - Toolchain location: C:\Keil_v5\ARM\ARMCC\Bin
Startup.s: - Selected tool variant: mdk_lite
Startup.s: Product: MDK-ARM Lite 5.30
Startup.s: Component: ARM Compiler 5.06 update 6 (build 750)
Startup.s: Tool: ArmAsm [4d35ec]
Startup.s: error: A3903U: Argument 'ARM7TDMI' not permitted for option 'cpu'.
compiling led3.C...
Error: C9580E: ARM7 is not available with the current toolkit and license. 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:
www.keil.com/.../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: C:\Keil_v5\ARM\sw\mappings
- Toolchain location: C:\Keil_v5\ARM\ARMCC\Bin
- Selected tool variant: mdk_lite
Product: MDK-ARM Lite 5.30
Component: ARM Compiler 5.06 update 6 (build 750)
Tool: ArmCC [4d3637]
Fatal error: C3903U: Argument 'ARM7TDMI' not permitted for option 'cpu'.
".\Objects\first.axf" - 4 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed: 00:00:01

I installed software and did one program but this error is showing to me how to tackle it.