ModelSim仿真出现near timescal！！！

新人一枚，仿真出现代码如下
`timescale   1ns/1ns   

module led_tb();
    reg clk;

    //always #DELAY clk=~clk;

    initial
    begin
        clk=0;
    end

endmodule   


编译后提示
vcom -work work -2002 -explicit -vopt -stats=none {H:/FPGA_PRO/FuncTest v1.0/LED/tb/led_tb.v}
Model Technology ModelSim SE-64 vcom 10.4 Compiler 2014.12 Dec  3 2014
-- Loading package STANDARD
** Error: H:/FPGA_PRO/FuncTest v1.0/LED/tb/led_tb.v(1): near "timescal":
** Error: H:/FPGA_PRO/FuncTest v1.0/LED/tb/led_tb.v(1): VHDL Compiler exiting


跪求！！！大神！！！