What am I doing wrong? Invalid attrid "MS" specified. The attrid will be ignored

[kimwonjin19]

I ran this code: 

DATA marker_map; 

input id $2. VALUE $7. MARKERSYMBOL $5. MARKERCOLOR $6.; 

VALUE = strip(value); 

DATALINES; 

 ms Male   X     blue

 ms Female plus  green

; 

run; 

PROC SGPANEL data= death_1 dattrmap=marker_map;  

panelby Age_group;

SCATTER Y = COVID_19_Deaths X = Total_Deaths / group =Sex attrid=ms; 

RUN;

And for some reason it runs the proc sgpanel BUT it doesn't want to read attrid=ms. It keeps returning with the warning: Invalid attrid "MS" specified. The attrid will be ignored. 

What am I doing wrong? 

[ballardw]

Provide the contents of your Dattrmap dataset marker_map.

If you do not have id "ms" that is the primary issue.