I'm quite new to state. I wanted to make the graph I created (which I'm also not sure of if its correct) "prettier".
I used this commands:
#delimit ;
graph twoway scatter mean_polity2_91_07 statehist_pre1500 if europe!=1
msymbol(oh) //
mcolor(gray) // color of marker - colorstyle (see below)
msize(1.5) // size of marker - markersizestyle
scheme(s1mono) // Schemes determine the overall look of a graph - s1mono has a plain background
name(graph1,replace); // save graph & allow to be overwritten
#delimit cr

But Stata tells me that symbol(oh) is invalid "invalid 'msymbol' r(198)"

What did i do wrong?

Thanks for your help!