m_map won't run

I'm trying to run m map, I have downloaded this and made it part of the pathway on matlab, I then run this line:

for nt = 313:324
    figure ()
    m_proj('miller','lon',[w e],'lat',[s n]);
    % m_pcolor(lon_sst,lat_sst,nanmean(sstGradMonthly(:,:,3:4),3).*1e2);
    % m_contourf(lon_sst,lat_sst,nanmean(sstGradMonthly(:,:,3:4),3).*1e2,(0:0.025:4),'edgeColor','none'); hold on;
    % m_contour(lon_sst,lat_sst,nanmean(sstGradMonthly(:,:,3:4),3).*1e2,(0:2:2),'edgeColor','k','lineWidth',1);
    
    
    m_pcolor(lonOce,latOce,sstGrad(:,:,nt).*1e2);
    shading flat; hold on;
    m_contourf(lonOce,latOce,sstGrad(:,:,nt).*1e2,(0:0.025:4),'edgeColor','none'); hold on;
    m_contour(lonOce,latOce,sstGrad(:,:,nt).*1e2,(0:2:2),'edgeColor','k','lineWidth',1);
    
    
    % m_pcolor(lonOce,latOce,sstMonthly(:,:,nt));
    % shading flat; hold on;
    % m_contourf(lonOce,latOce,sstMonthly(:,:,nt),(24:0.25:32),'edgeColor','none'); hold on;
    % hold on;
    % m_quiver(lonOce(1:3:end,1:3:end),latOce(1:3:end,1:3:end),uoMonthly(1:3:end,1:3:end,nt),voMonthly(1:3:end,1:3:end,nt),'Color','k');
    % hold on;
    
    % m_pcolor(lonOce,latOce,nanmean(sstMonthly,3));
    % shading flat; hold on;
    % m_contourf(lonOce,latOce,nanmean(sstMonthly,3),(24:0.25:32),'edgeColor','none'); hold on;
    % hold on;
    % m_quiver(lonOce(1:3:end,1:3:end),latOce(1:3:end,1:3:end),nanmean(uoMonthly(1:3:end,1:3:end,:),3),nanmean(voMonthly(1:3:end,1:3:end,:),3),'Color','k');
    % hold on;
    
    
    m_gshhs_f('patch','w','edgeColor',[.2 .2 .2],'linewidth',.5); hold on;
    m_grid('linestyle','none','xtick',6,'ytick',4,'fontsize',16);
    
    title([datestr(datenum(time(nt)),'mmmm yyyy')],'fontsize',16,'fontweight','b');
    % title([datestr(datenum(1,nt,1),'mmmm')],'fontsize',16,'fontweight','b');
    % title(['Winter Season (DJF)'],'fontsize',16,'fontweight','b');
    
    xlabel ('Longitude','fontsize',16);
    ylabel ('Latitude','fontsize',16);
    cb = colorbar ('eastoutside','fontsize',16);
    xlabel(cb,'{\times} 10^{-2} ({\circ}C/km)','fontsize',16)
    % xlabel(cb,'Sea surface temperature ({\circ}C)','fontsize',16)
    
    caxis([0 4]);
    % caxis([24 32]);
    cmap = getPyPlot_cMap('RdYlBu_r', 32);
    colormap (cmap);
    set(gcf, 'Position', get(0, 'Screensize'));
    
    export_fig([outputFolder sprintf(['sstGradSS' datestr(datenum(time(nt,:)),'yyyymm')])], '-png', '-transparent');
    % export_fig(sprintf(['sstSeasonalJS01DJF']), '-png', '-transparent');
    close;
end

but get given this error :

Index in position 3 exceeds array bounds (must not exceed 109).

Error in upwDataProc (line 113)
m_pcolor(lonOce,latOce,sstGrad(:,:,nt).*1e2);
 

I have checked the file and everything is there and in the pathway, plus have redownloaded mutliple times, so if anyone has any ideas that would be a great help, thank you.

[Walter Roberson]

Before the for loop, what shows up for

size(sstGrad)

I predict that it will show up having a third dimension of 109, but the code assumes it has a third dimension of at least 324. We do not know what the code to that point is doing to justify a belief that at least 324 layers exist.