Spaghetti plot Graph window

[Annabelle Coleman]

Hello STATALIST users,

I am having trouble with some code to draw a spaghetti plot. Each time I run the code it brings back an error "graph Graph not found" and I cannot see where I am going wrong.

foreach obj in B2b {
    
    foreach analyte of varlist NfL GFAP Tau {
    cd .. 
        cd "3. Graphs"
            cd "`obj'" 
                cd `analyte'
                
                
        foreach col_type in Venepuncture Finger-prick  {
            preserve
            drop if Objective!="`obj'" | ///
            `analyte'==. | ///
            CollectionType!="`col_type'"
            
        capture ///
        xtline `analyte' , i(ID_visit) t(sample_delay1)  ///
            overlay legend(off) aspectratio(1) ///
            xlabel("``obj'xlab`col_type''", valuelabel) ///
            ylabel(``obj'`analyte'ylab') ///
            yscale(range(``obj'`analyte'y')) xscale(lwidth(thick)) yscale(lwidth(thick)) ///
            ``obj'xaxis`col_type'' ///     
            gr_edit .plotregion1.style.editstyle boxstyle(linestyle(color(none))) editcopy
        //    name(`obj'_`analyte'_`col_type', replace)
                graph save "`analyte'_`obj'_`col_type'_Spag_plot.gph" , replace
                graph export "`analyte'_`obj'_`col_type'_Spag_plot.png" , replace
                graph export "`analyte'_`obj'_`col_type'_Spag_plot.eps" , replace
            
            restore
        }
                
                cd ..
            cd ..
        cd ..
    cd "2. dta files"
    
    }
}

return code:

graph Graph not found r(111);

I have tried this where I have taken out the first loop "foreach obj in B2b {" and the response it gave was:

could not find Graph window
r(693);

Is there a way around this? each line I am drawing is for a different participant.