我在调试的时候，出现了这个错误，我指定了头文件的位置：C:\Program Files\Texas Instruments\pdk_C6678_1_0_0_9_beta2\packages\ti\csl\ 。头文件里面有相应的文件，但是，却出现这个错误。这是为什么呢？
**** Build of configuration Debug for project 123 ****
D:\CCS5.0\ccsv5\utils\gmake\gmake -k all
'Building file: ../src/MNav_Init.c'
'Invoking: C6000 Compiler'
"D:/CCS5.0/ccsv5/tools/compiler/c6000/bin/cl6x" -mv6600 -g --include_path="D:/CCS5.0/ccsv5/tools/compiler/c6000/include" --include_path="C:\Program Files\Texas Instruments\pdk_C6678_1_0_0_9_beta2\packages\ti\drv\qmss\firmware" --include_path="C:\Program Files\Texas Instruments\pdk_C6678_1_0_0_9_beta2\packages\ti\csl" --diag_warning=225 --abi=eabi --preproc_with_compile --preproc_dependency="src/MNav_Init.pp" --obj_directory="src" "../src/MNav_Init.c"
"C:\Program Files\Texas Instruments\pdk_C6678_1_0_0_9_beta2\packages\ti\csl\cslr_device.h", line 37: fatal error: could not open source file "ti/csl/cslr.h"
