buildit.s question

Hello!
I am still not able to build my own floppy.

What i did:
cd /tmp/tomsrtbt-2.0.103/
./unpack.s tomsrtbt.raw 
cd tomsrtbt-2.0.103.unpacked/1/
(edited soem files and replaced kernel..)

cd /tmp/tomsrtbt-2.0.103/tomsrtbt-2.0.103.unpacked/

linux:/tmp/tomsrtbt-2.0.103/tomsrtbt-2.0.103.unpacked # ./buildit.s 
bash: ./buildit.s: bad interpreter: Datei oder Verzeichnis nicht
gefunden

What am i doing wrong? 

Cheers, Mario