[Erw-devel] Configuration problem - erlElementId.php not found

[erw-devel]

hi all,
	am new to ERW and I am having some problems in configuring ERW. 
When I use the chechERW.php to check my ERW settings, I get this message :

Main definition file "../defs/erlElementId.php" not found 
(/usr/local/apache2/php/lib/php/ERW.php:292)

at what stage is erlElementId.php file created ? will ertool --defs < 
library.xml create this file ?

Thanks,
Arun