modelsim中出现这种问题，求帮忙看一下

** Warning: (vsim-7) Failed to open readmem file "./sin_12.txt" in read mode.

No such file or directory. (errno = ENOENT) : E:/shuzijichen/abc/DDS/rtl/sin_rom.v(25)

Time: 0 ps Iteration: 0 Instance: /DDS_top_tb/inst_DDS_top/inst_DDS/inst_sin_rom

** Warning: (vsim-7) Failed to open readmem file "./sanjaio_12.txt" in read mode.

No such file or directory. (errno = ENOENT) : E:/shuzijichen/abc/DDS/rtl/sanjiao_rom.v(25)

Time: 0 ps Iteration: 0 Instance: /DDS_top_tb/inst_DDS_top/inst_DDS/inst_sanjiao_rom

** Warning: (vsim-7) Failed to open readmem file "./juchi_12.txt" in read mode.

No such file or directory. (errno = ENOENT) : E:/shuzijichen/abc/DDS/rtl/juchi_rom.v(25)

Time: 0 ps Iteration: 0 Instance: /DDS_top_tb/inst_DDS_top/inst_DDS/inst_juchi_rom

** Warning: (vsim-7) Failed to open readmem file "./fangbo_12.txt" in read mode.

No such file or directory. (errno = ENOENT) : E:/shuzijichen/abc/DDS/rtl/fangbo_rom.v(25)

Time: 0 ps Iteration: 0 Instance: /DDS_top_tb/inst_DDS_top/inst_DDS/inst_fangbo_rom