In reply to sush:
I get not such error.
$ vlog A.v B.v C.v
QuestaSim vlog 10.3 Compiler 2014.01 Jan 6 2014
Start time: 06:55:45 on Jan 07,2015
vlog A.v B.v C.v
-- Compiling module A
-- Compiling module B
-- Compiling module top
Top level modules:
top
End time: 06:55:45 on Jan 07,2015
Errors: 0, Warnings: 0
$ vsim -c top -do "run -all;quit"
Reading C:/questasim_10.3/tcl/vsim/pref.tcl
# 10.3
# vsim -do "run -all;quit" -c top
# Start time: 06:55:48 on Jan 07,2015
# ** Note: (vsim-8009) Loading existing optimized design _opt
#
# // Questa Sim
# // Version 10.3 win32 Jan 6 2014
# //
# // Copyright 1991-2014 Mentor Graphics Corporation
# // All Rights Reserved.
# //
# // THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION
# // WHICH IS THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS
# // LICENSORS AND IS SUBJECT TO LICENSE TERMS.
# //
# Loading work.top(fast)
# run -all
# quit
# End time: 06:55:48 on Jan 07,2015
# Errors: 0, Warnings: 0