请教各位了， 我用vs2005定制内核时出现以下错误，是怎么回事：
用vs2005建立Platform Builder for CE 6.0工程时，提示The global default build tree (WINCEROOT) has not been set, or is invalid. Make sure that the WINCEROOT is set correctly before creating an OS design. To view the current setting for the WINCEROOT, from the WINCEROOT, from the Tools menu, choose Options, and then navigate to the Platform Builder OS Design and Build Options.
