problem building a project

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does anybody know why I get this error when I choose to build the project at web dynpro perspective?

May 10, 2011 5:34:00 PM /userOut/Development Component (com.sap.ide.eclipse.component.provider.listener.DevConfListener) [Thread[ModalContext,5,main]] ERROR: gp/ui/lib/mdmjavaapi: Build failed for vale.com/gp/ui/lib/mdmjavaapi(MyComponents) in variant "null": null

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Build log -

Development Component Build (2011-05-10 17:33:59)

Component name: gp/ui/lib/mdmjavaapi

Component vendor: vale.com

SC compartment: MyComponents

Configuration: LocalDevelopment

Location: local

Source code location: mario.mesquita@ACRENTBRG845F207

DC root folder: D:\Documents and Settings\mario.mesquita\.dtc\LocalDevelopment\DCs\vale.com\gp\ui\lib\mdmjavaapi\_comp\

DC type: External Library

Host: ACRENTBRG845F207

DC Model check:

All used DCs are available locally

validating dependency to build plugin "sap.com/tc/bi/bp/externalarchive"

DC model check OK

Start build plugin: