Encounter mistakes when deleloping Multi-Component Applications

I have a good understanding of one-component webdynpro application.
recently, I am studing Multi-Component Applications using the book "Web Dynpro for ABAP",whose cover we can see from "http://www.sap-press.com/product.cfm?account=&product=H1916".
simulating the example in chapter four,I delelop a Multi-Component Application, named "ZEXP_CONVERSION_RM".
when I have finished the application's coding and corrected all the syntax errors, I try to run this application, but then mistakes appears in the web page,as follow:
The URL http://idsecc6.inventec.com:8000/sap/bc/webdynpro/sap/zexp_conversion_rm/ was not called due to an error.
Note
The following error text was processed in the system IDE : Lower-Level Node with Name W_DEFAULT.ROADMAP Does Not Exist
The error occurred on the application server idsecc6_IDE_00 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
Method: GET_CHILD_NODE_INTERNAL of program CL_WDR_CONTEXT_ELEMENT========CP
Method: IF_WD_CONTEXT_ELEMENT~GET_CHILD_NODE of program CL_WDR_CONTEXT_ELEMENT========CP
Method: IF_WD_CONTEXT_NODE~GET_CHILD_NODE of program CL_WDR_CONTEXT_NODE_VAL=======CP
Method: WDDOINIT of program /1BCWDY/LOIUBMLJHFLAXWWPEXES==CP
Method: IF_WDR_VIEW_DELEGATE~WD_DO_INIT of program /1BCWDY/LOIUBMLJHFLAXWWPEXES==CP
Method: DO_INIT of program CL_WDR_DELEGATING_IF_VIEW=====CP
Method: INIT_CONTROLLER of program CL_WDR_CONTROLLER=============CP
Method: INIT_CONTROLLER of program CL_WDR_VIEW===================CP
Method: INIT_CONTROLLER of program CL_WDR_INTERFACE_VIEW=========CP
Method: INIT of program CL_WDR_CONTROLLER=============CP
what should I do? help me please!

Hey jeery,
Go to the web site of the book i. e www.INIDFAB.COM go to the book section and updates are available there.all these examples are available to download.
Nirad

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Encounter mistakes when deleloping Multi-Component Applications

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