Mrthfx

Please find the MWE below and kindly help me to fix my issues.

documentclass[portrait,a0b,posterdraft]{a0poster} %% posterdraft is for printing the poster on a4 size.

usepackage[paperheight=119cm,paperwidth=91cm,margin=2cm]{geometry}
usepackage{graphicx}
usepackage{caption}
usepackage{MyriadPro} % one has to run Xelatex when pdflatex is creating trouble.
renewcommand{familydefault}{sfdefault}
usepackage{lmodern} % necessary to get the san serif font family.
usepackage{natbib}
usepackage{tabularx}
usepackage{setspace}
usepackage{float}
usepackage{blindtext}
usepackage[svgnames,dvipsnames]{xcolor}
usepackage{tcolorbox}
usepackage{enumitem}
usepackage{multicol}
usepackage{tikz}
usetikzlibrary{angles,scopes,positioning,decorations.text,shapes,backgrounds,fadings}
usetikzlibrary{shapes.multipart}
usepackage{pgfplots}
pgfdeclarelayer{foreground}
pgfdeclarelayer{background}
pgfsetlayers{background,main,foreground}

%%
makeatletter
defvhrulefill#1{leavevmodeleadershrule@height#1hfill kernz@}
makeatother %% this patch is to change the thickness of the hrule width.

definecolor{mygreen}{RGB}{116,185,41} %% define the green color according to your need.
definecolor{myblue}{RGB}{0,110,174}%% define blue color for your need
definecolor{circleblue}{RGB}{131,173,211} %% define different shades of blue
definecolor{myorange}{RGB}{226,125,50} %% for circle outline..

%%
begin{document}

noindent
begin{minipage}[t]{linewidth}
% begin{center}
{fontsize{60pt}{30pt}selectfont color{mygreen} textbf{Synthesis and XXX}}[1cm]
{fontsize{40pt}{30pt} selectfont color{mygreen} textbf{underline{Author1}textsuperscript{1} and Author2textsuperscript{1}}}[1cm]
{fontsize{36pt}{30pt} selectfont color{mygreen} textbf{textsuperscript{1}Affiliation}}[0.5cm]
begin{tikzpicture}[remember picture, overlay]
node [anchor=north east, inner sep=2cm] at (current page.north east)
{includegraphics[height=8cm]{logo}};
end{tikzpicture}
%end{center}
end{minipage}
%hspace{baselineskip}
noindentcolor{mygreen}{vhrulefill{20pt}} % vhrulefill patch is necessary to change thickness of the line here.

vspace{0.8cm}
noindent
begin{tikzpicture}[thick]
node at (-25,38) [circle,minimum size=55cm,draw=myorange,line width=10pt,inner sep=0pt,outer sep=0,fill=circleblue]{};
node at (20,38) [circle,minimum size=55cm,draw=myorange,line width=10pt,inner sep=0pt,outer sep=0,fill=circleblue]{}; %% second circle
node at (-25,-1) [circle,minimum size=55cm,draw=myorange,line width=10pt,inner sep=0pt,fill=circleblue]{};
node at (13.15,-1) [circle,minimum size=55cm,draw=myorange,line width=10pt,inner sep=0pt,fill=circleblue]{};
end{tikzpicture}

end{document}