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Compilation error: A1859E: Flag preserving form of this instruction not available

When I am compiling the following Assembly Language Code, I am getting the below error:

AREA mydata, DATA

COUNT EQU 10
SUM EQU 0

AREA mycode, CODE

ENTRY EXPORT __main

__main LDR r0, =COUNT LDR r1, =SUM LDR r2, =1

myLoop ADD r1, r2, r1 ADD r2, r2, #1 SUBS r4, r0, r2

BNE myLoop ADD r1, r2, r1

stop B stop

END

-----------------------------------------------------------------------------------

*** Using Compiler 'V5.06 update 4 (build 422)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'
Build target 'STM32L011D'
assembling ASM_Sum.s...
ASM_Sum.s(18): error: A1859E: Flag preserving form of this instruction not available
".\Objects\ARM_AL1.axf" - 1 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed: 00:00:00

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