Error Message: Can't assign to Operator

[Jonathon]

	I keep hitting this error message:
	SyntaxError:  can't assign to operator(line 3056)
	
	Line 3056 is
	meta-previous = string.join( the_ultimate_file_destination_is_this, string_record_id, suffix )
        
	the_ultimate_file_destination_is_this, string_record_id and  suffix 
	are all defined elsewhere.

	Questions:

	Why does that construct not work?
	How can I fix this construction?

	If you want the entire script, it is available at
	http://www.stamp-coin.com/python/script-error/index.html
	<< Actually, that points you to the file that can be
	downloaded. >>
	
	xan

	jonathon