I don't know anything about tinycobol ...
... but the error message, "sh: as: command not found", suggests that tinycobol is looking for an assembler. Probably the Gnu Assembler ("gas").
Here's a link that lists dependencies for Tinycobol - it looks like there's a lot of them (including "as", but also gcc, yacc, lex, curses, getopts and many others):
http://tiny-cobol.sourceforge.net/docs/wiki/
At a minimum, please do "apt-get", install Gas, and see if you get any further.
'Hope that helps .. PSM