求助：quartus关联modelsim出现问题

# ** Error: (vsim-SDF-3894) sim_v.sdo: Compiled SDF file was not found.
# ** Error: (vsim-7) Failed to open SDF file "sim_v.sdo" in read mode.
# No such file or directory. (errno = ENOENT)
# ** Error: (vsim-SDF-3445) Failed to parse SDF file "sim_v.sdo".
#    Time: 0 ps  Iteration: 0  Region: /testsim  File: E:/verilog/project/simulation/modelsim/testsim.v
# Error loading design
以上是我调用modelsim时出现的错误，麻烦各位高人不吝赐教，帮小弟解决这个棘手的问题！！