the problems occur in Memory.cmd when building in CCS

Hi,

When building the project named testdpu_C6678 in CCS ,  the problem is below: 

'Building target: testdpu_C6678.out'
'Invoking: C6000 Linker'
"C:/ti/C6000 Code Generation Tools 7.2.1/bin/cl6x" -mv6600 -g -O3 --
define=xdc_target_types__=ti/targets/std.h --define=LUMPED_VELVAR --define=PROFILE_CYCLES -
-define=NO_XDC --define=DISABLE_PLACEMENT --define=USE_OS --define=ti_targets_C66 --
diag_warning=225 --abi=eabi -k -z -m"testdpu_C6678.map" --warn_sections -i"C:/ti/C6000 Code
Generation Tools 7.2.1/lib" -i"C:/ti/C6000 Code Generation Tools 7.2.1/include" -
i"D:/workspace/miAlgos/dpu/test/ccsProj_C6678/testdpu/../../../../util/make_c66_lib/utillib/
Release" -
i"D:/workspace/miAlgos/dpu/test/ccsProj_C6678/testdpu/../../../../dpu/make_c66_lib/dpulib/Re
lease" --reread_libs --rom_model -o "testdpu_C6678.out" -l"./configPkg/linker.cmd"
"./testdpu.obj" "./fileIo.obj" "./edma3_config.obj" -l"dpulib_c66.lib" -l"util.lib" -
l"rts6600_elf.lib" -l"libc.a" "../Memory.cmd"
<Linking>
"../Memory.cmd", line 26: warning: no matching section
"../Memory.cmd", line 28: warning: no matching section
"../Memory.cmd", line 29: warning: no matching section
"../Memory.cmd", line 30: warning: no matching section
"../Memory.cmd", line 31: warning: no matching section
"../Memory.cmd", line 32: warning: no matching section
"../Memory.cmd", line 27: warning: no matching section
"../Memory.cmd", line 25: warning: no matching section
"../Memory.cmd", line 24: warning: no matching section
"../Memory.cmd", line 33: warning: no matching section
"../Memory.cmd", line 7: warning: memory range not found: DDR2 on page 0
"../Memory.cmd", line 7: error: no valid memory range(NULL) available for
placement of "GROUP_2"
"../Memory.cmd", line 7: error: placement fails for object "GROUP_2", size
0x3ec60 (page 0)
"../Memory.cmd", line 34: warning: memory range not found: DDR2 on page 0
"../Memory.cmd", line 23: error: run placement fails for object ".activecode",
size 0x0 (page 0)
"../Memory.cmd", line 36: warning: memory range not found: DDR2 on page 0
"../Memory.cmd", line 36: error: run placement fails for object ".text:_task",

>> Compilation failure
size 0x0 (page 0)
error: errors encountered during linking; "testdpu_C6678.out" not built
gmake: *** [testdpu_C6678.out] Error 1
gmake: Target `all' not remade because of errors.

the content of Memory.cmd is below:

-x

SECTIONS
{

GROUP > DDR2
{
.iobuff
.tables
.coefbuf
.bss
.far
.const
.switch
.data
.cio
.sysmem
.cinit
.text
}

.activecode {
rts64plus.lib <fwrite.obj> (.text)
rts64plus.lib <fread.obj> (.text)
rts64plus.lib <divu.obj> (.text:__divu)
rts64plus.lib <memset.obj> (.text)
rts64plus.lib <_bufread.obj> (.text:__buff_read)
rts64plus.lib <lowlev.obj> (.text:_read)
rts64plus.lib <setvbuf.obj> (.text:_setvbuf)
rts64plus.lib <_io_perm.obj> (.text:__wrt_ok)
rts64plus.lib <_io_perm.obj> (.text:__rd_ok)
*(.active_code)
} > DDR2

.text:_task :> DDR2

}

so,could you give me some suggestions to slove the question?