C6748 SDK pdk BIOSPSP i2c例程build报错的解决办法？

**** Build of configuration Debug for project i2cSample ****
"C:\ti\ccsv5\utils\bin\gmake" -k all
'Building file: ../i2cSample.cfg'
'Invoking: XDCtools'
"C:/ti/xdctools_3_24_05_48/xs" --xdcpath="/packages;;/packages;/drivers;C:/ti/ccsv5/ccs_base;" xdc.tools.configuro -o configPkg -t ti.targets.elf.C674 -p ti.platforms.evm6748 -r debug -c "C:/ti/ccsv5/tools/compiler/c6000_7.4.1" "../i2cSample.cfg"
making package.mak (because of package.bld) ...
generating interfaces for package configPkg (because package/package.xdc.inc is older than package.xdc) ...
configuring i2cSample.xe674 from package/cfg/i2cSample_pe674.cfg ...
js: "C:/Users/why/workspace_v5_3/i2cSample/i2cSample.cfg", line 8: xdc.services.global.XDCException: xdc.PACKAGE_NOT_FOUND: can't locate the package 'ti.sy***ios.io' along the path: 'C:/packages;C:/drivers;C:/ti/ccsv5/ccs_base;C:/ti/xdctools_3_24_05_48/packages;..;'. Ensure that the package path is set correctly.
    "./package/cfg/i2cSample_pe674.cfg", line 197
    "./package/cfg/i2cSample_pe674.cfg", line 276
    "./package/cfg/i2cSample_pe674.cfg", line 184
gmake.exe: *** [package/cfg/i2cSample_pe674.xdl] Error 1
Warning: directory "C:/packages" on package path does not exist
Warning: directory "C:/drivers" on package path does not exist
js: "C:/ti/xdctools_3_24_05_48/packages/xdc/tools/Cmdr.xs", line 51: Error: xdc.tools.configuro: configuration failed due to earlier errors (status = 2); 'linker.cmd' deleted.
gmake: *** [configPkg/compiler.opt] Error 1
gmake: Target `all' not remade because of errors.
**** Build Finished ****
我是按user guide上面一步一步来的，刚入门完全不懂。请教.帮忙。