This is the error message:
*** Using Compiler 'V5.06 update 6 (build 750)', folder:
Build target 'Target 1'
.\Objects\pro.axf: Error: L6218E: Undefined symbol main (referred
Not enough information to list image symbols.
Not enough information to list load addresses in the image map.
Finished: 2 information, 0 warning and 1 error messages.
".\Objects\pro.axf" - 1 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed: 00:00:00
and here is the code:
AREA PROGRAM,CODE,READONLY ENTRY LDR r4,=a; LDR r0,[r4]; B1 B B1 a
DCD 0x45 END