how to solve symbolic matrix equations

I have to solve simultaneous matrix equations [x*A==0, x*e==1], here entries of A are arbitrary constants. X is the row vecor of variables, e is the coloumn vector of ones. I tried as below,, but didnt get desired output like X=....

please help me.. I am only a beginner in matlab.

S=10;s=3;N1=2;

N2=4;u1=4*S;

A0=sym(zeros(u1));

for i=1:u1

A0(i,i)='lamda';

end

A0;

%A2

A2=sym(zeros(u1));

A2(S+2,1)='mu1';

A2(2*S+2,1)='mu2';

A2(3*S+2,S+2)='mu1';

A2(3*S+2,2*S+2)='mu2';

for i=S+3:2*S+1;

A2(i,i-1)='mu1';

end

for i=2*S+3:3*S+1;

A2(i,i-1)= 'mu2';

end

for i=3*S+3:4*S

A2(i,i-1)='mu1+mu2';

end

A2;

%A1

A1=sym(zeros(u1));

A1(1,1)='-(lamda+theta)';

for i=2:s+1;

A1(i,i)= '-(theta+lamda+beta1)';

end

for i=s+2:N2;

A1(i,i)='-(lamda+beta1)';

end

for i=N2+1:S+1;

A1(i,i)= '-(lamda+beta1+beta2)';

end

for i=2:S+1;

A1(i,S+i)='beta1';

end

for i=N2+1:S+1;

A1(i,2*S+i)='beta2';

end

for i=1:s+1;

A1(i,i+Q)='theta';

end

for i=S+2:S+1+s;

A1(i,i+Q)= 'theta';

end

for i=2*S+2:2*S+1+s;

A1(i,i+Q)= 'theta';

end

for i=3*S+2:3*S+s;

A1(i,i+Q)= 'theta';

end

for i=S+2:S+1+s;

A1(i,i)= '-(theta+lamda+mu1)';

end

for i=S+s+2:2*S+1;

A1(i,i)= '-(lamda+mu1)';

end

for i=2*S+2:2*S+1+s;

A1(i,i)= '-(theta+lamda+mu2)';

end

for i=2*S+s+2:3*S+1;

A1(i,i)= '-(lamda+mu2)';

end

for i=3*S+2:3*S+s;

A1(i,i)= '-(theta+lamda+mu1+mu2)';

end

for i=3*S+s+1:4*S;

A1(i,i)= '-(lamda+mu1+mu2)';

end

A1;

%finding pi and stability checking

A=sym(zeros(u1));

A=A0+A1+A2

x=sym('x',[1 u1])

e=ones(u1,1));

sol=[x*A==0, x*e==1]