Memory overflow instead Undefined identifier error message about asmsx HOT 5 CLOSED

aaa equ 20
.ds 3*aa

asmsx test.asm                                                                   
-------------------------------------------------------------------------------                
 asMSX v.0.19.3. MSX cross-assembler. Eduardo A. Robsy Petrus [01/11/2020]                     
-------------------------------------------------------------------------------                
Parsing file test.asm                                                                          
Expanding system macros                                                                        
Assembling source file test.asm                                                                
Assembling labels, calls and jumps                                                             
test.asm, line 2: undefined identifier

PSEUDO_DS value_16bits
	{
		if (conditional[conditional_level])
		{
			if (start_address > PC)
				start_address = PC;
                        fprintf(stderr, "PC: %i ePC: %i\n", PC, ePC);
			PC += $2;
			ePC += $2;
                        fprintf(stderr, "PC: %i ePC: %i\n", PC, ePC);
			if (PC > 0xffff)
				error_message(1, fname_src, lines);           // <----- Memory overflow error is reported here
		}
	}

int read_label(char *name)
{
    if (verbose >= 2) 
    {
        fprintf(stderr,"Reading label: %s - on pass %u\n", name, pass);
    }

    // Search the label
	int i;
    
    // Find the label and return its value if found.
    i = search_label(id_list, name, 0, total_global);
    if (verbose >= 2) 
    {
        fprintf(stderr, "- Label index in vector: %i\n", i);
    }
    if (i != -1) return id_list[i].value;
    

    // If label not found and we're in the first pass, we leave it for the
    // second pass
	if ((pass == 1) && (i == -1))
		return ePC;

    // Else, ERROR
	error_message(12, fname_src, lines);
	exit(0);	/* error_message() never returns; add exit() to stop compiler warnings about bad return value , fname_src, lines*/
}

    // If label not found and we're in the first pass, we leave it for the
    // second pass
	if ((pass == 1) && (i == -1))
		return ePC;

if (PC > 0xffff)
    error_message(1, fname_src, lines);           // <----- Memory overflow error is reported here