Returning from PXE Advanced Menu runs into Chainload failure

[x23piracy]

Hi,

i am trying my old pxe advanced menu and it is working except the return function to get back to main menu:

:return
chain http://${fog-ip}/${fog-webroot}/service/ipxe/boot.php?mac=${net0/mac} ||
prompt
goto MENU

entire menu:

:MENU
menu
item --gap -- blabla Boot Menu - blabla
item --gap --
item bootlocal Festplatte booten
item --gap Betriebssystem installieren
item --key 7 win7 Windows 7 x64 Vollautomatisch! PE 4.0
item --key 2 win72 Windows 7 x64 Festplatten-Dialog PE 4.0
item --key 3 win73 Windows 7 x64 Festplatten-Dialog PE 5.0
item --gap Partition/Image/Backup
item --key b acronis2014 Acronis True Image 2014
item --key c acronis20142 Acronis True Image 2014 PE
item --key r acronis20143 Acronis True Image 2014 PE RT
item --key p easeuspms EaseUS Partition Master Server
item --gap Password/Recovery/Restore/Repair
item --key e erd2005 ERD Commander Windows XP
item --key d dart7 DaRT 7.0 Windows 7 Server 2008 R2
item --gap --
item return<---
choose --default bootlocal --timeout 60000 target && goto ${target}
:bootlocal
sanboot --no-describe --drive 0x80 || goto MENU
:win7
initrd http://${fog-ip}/iso/win7.iso
chain memdisk iso raw ||
goto MENU
:win72
initrd http://${fog-ip}/iso/win7_dialog.iso
chain memdisk iso raw ||
goto MENU
:win73
initrd http://${fog-ip}/iso/win7pe5_dialog.iso
chain memdisk iso raw ||
goto MENU
:win74
chain -ar ${boot-url}/service/ipxe/advanced.php?login=1 ||
goto MENU
:acronis2013
initrd http://${fog-ip}/iso/acronis2013.iso
chain memdisk iso raw ||
goto MENU
:acronis2014
initrd http://${fog-ip}/iso/acronis2014.iso
chain memdisk iso raw ||
goto MENU
:acronis20142
initrd http://${fog-ip}/iso/acronis2014pe.iso
chain memdisk iso raw ||
goto MENU
:acronis20143
initrd http://${fog-ip}/iso/acronis2014pert.iso
chain memdisk iso raw ||
goto MENU
:easeuspms
initrd http://${fog-ip}/iso/easeuspms.iso
chain memdisk iso raw ||
goto MENU
:erd2005
initrd http://${fog-ip}/iso/erd2005.iso
chain memdisk iso raw ||
goto MENU
:dart7
initrd http://${fog-ip}/iso/dart7.iso
chain memdisk iso raw ||
goto MENU
:shell
shell ||
goto MENU
:return
chain http://${fog-ip}/${fog-webroot}/service/ipxe/boot.php?mac=${net0/mac} ||
prompt
goto MENU
autoboot

What is wrong here?

Regards X23