preFab3D生成后，FLASH导出swf报如下错误，求高手！
夏天 (2010-09-27 14:38:15)
TypeError: Error #1009: 无法访问空对象引用的属性或方法。
at away3d.loaders::AWData/linkBSPNodes()[F:项目文件7secaway3d ags3.5.0 libsrcaway3dloadersAWData.as:466]
at away3d.loaders::AWData/prepareData()[F:项目文件7secaway3d ags3.5.0 libsrcaway3dloadersAWData.as:306]
at away3d.loaders::AbstractParser/parseGeometry()[F:项目文件7secaway3d ags3.5.0 libsrcaway3dloadersAbstractParser.as:420]
at away3d.loaders::Loader3D/loadTextures()[F:项目文件7secaway3d ags3.5.0 libsrcaway3dloadersLoader3D.as:466]
at away3d.loaders::Loader3D$/parse()[F:项目文件7secaway3d ags3.5.0 libsrcaway3dloadersLoader3D.as:61]
at away3d.loaders::AWData$/parse()[F:项目文件7secaway3d ags3.5.0 libsrcaway3dloadersAWData.as:544]
at MyBSPProject/initAway3D()[C:UsersAdministratorDesktopmyBSPTreeMyBSPProject.as:92]
at MyBSPProject/init()[C:UsersAdministratorDesktopmyBSPTreeMyBSPProject.as:68]
