Tool/software: Code Composer Studio

I have successfully loaded a program on a C3x simulator (TMS320C31), however I am getting the following error:

Can't Single Step Target Program

Error number -2154

Error address 0

The error occurs while single stepping certain type of instruction, when I try to load a variable into a register

for example in my asm code:

    .data
x   .float    1.12345

then in my main function:

LDF    @x,R0