The source filesystem "/run/archiso/bootmnt/arch/x86_64/airootfs.sfs" does not exist

[helwan-linux]

Hello Sir ,
I am building my own arch based distro using archiso I put everything togother
and everything went well , but every time I try to install the distro after I choose
EFI partion and root partion then hit next , Calamares brings this error and
the installing process stops :

The source filesystem "/run/archiso/bootmnt/arch/x86_64/airootfs.sfs" does not exist

I am not experienced enough to handle this error , so please help me to pass this error
why it pop up and how to fix it , thanks in foreword