Error: branch out of range

        .syntax unified

        .cpu    cortex-m4

        .fpu    fpv4-sp-d16

        .thumb

        .text

        .pool

        .global search,put

        .org 0x400

@@@@@@@@@@@@@@@@@@@@@@@@@

@ search list of WORDs in memory (2bytes), .asciz ... , .align 2

@        .word 0x1234 ; .asciz "apfel"  ; .align 2

@        .word 0x2345 ; .asciz "birne"  ; .align 2

@        .word 0xaaaa ; .asciz "banane" ; .align 2

@        .word 0

search: push {r0-r5,lr}

        ldr r4,= dict

1:      ldrh r1,[r4]   @ test next token word

        cbz r0,5f      @ not_found

        cmp r0,r1

        bne 3f

        mov r0,r4

        add r0,#2

        bl puts

        b 5f

2:      add r4,#2     @ advance word pointer to point to asciz

3:      ldrb r1,[r4],#1

        cbnz  r1,3b    @ skip until 0 >> diese Zeile macht den 28: Error: branch out of range

        mov r3,r4

        and r3,#1     @ is r4 odd?

        cbz r3,4f     @ r3/4 is even on branch

        add r4,#1

4:      b 1b

5:

        pop {r0-r5,pc}

        .pool

        .align 4

dict:   .hword 0x1234; .byte 'h','e','l','l',0 ; .align 2

        .hword 0x2345;  .byte 'w','o','r','l','d',0 ; .align 2

        .hword 0

        .end