Modelsim出错：Failed to access library

Jeecoun

在用Modelsim仿真时，出现以下错误：
# do {testbench.fdo}
# ** Warning: (vlib-34) Library already exists at "work".
# Model Technology ModelSim SE vlog 6.5 Compiler 2009.01 Jan 22 2009
# -- Compiling module testModel
#
# Top level modules:
#  testModel
# Model Technology ModelSim SE vlog 6.5 Compiler 2009.01 Jan 22 2009
# -- Compiling module testbench
#
# Top level modules:
#  testbench
# Model Technology ModelSim SE vlog 6.5 Compiler 2009.01 Jan 22 2009
# -- Compiling module glbl
#
# Top level modules:
#  glbl
# vsim -L xilinxcorelib_ver -L unisims_ver -L unimacro_ver -lib work -t 1ps testbench glbl
# ** Note: (vsim-3812) Design is being optimized...
# ** Error: (vopt-19) Failed to access library 'xilinxcorelib_ver' at "xilinxcorelib_ver".
# No such file or directory. (errno = ENOENT)
# ** Error: testbench.v(61): Library xilinxcorelib_ver not found.
# ** Warning: Unable to find library 'xilinxcorelib_ver'.
# ** Error: (vopt-19) Failed to access library 'unisims_ver' at "unisims_ver".
# No such file or directory. (errno = ENOENT)
# ** Error: testbench.v(61): Library unisims_ver not found.
# ** Warning: Unable to find library 'unisims_ver'.
# ** Error: (vopt-19) Failed to access library 'unimacro_ver' at "unimacro_ver".
# No such file or directory. (errno = ENOENT)
# ** Error: testbench.v(61): Library unimacro_ver not found.
# ** Warning: Unable to find library 'unimacro_ver'.
# Optimization failed
# Error loading design
# Error: Error loading design
#        Pausing macro execution
# MACRO ./testbench.fdo PAUSED at line 8

这个错误有点像inst.eecs.berkeley.edu/~cs152/fa06/handouts/RDCInfo.pdf  所描述的错误，但是里面没有说明白怎么改，不知道谁能帮忙下，谢谢。

down_load

修改文件只读属性，就这么easy