A MATLAB error integration Explicit integral

This integration cannot get the result Can you help to sovle this error？Thank you

 syms x y r s u v;
 OTF=(exp(2*pi*1i*(x.^3+x.*y.^2+y.^4+x.^2.*y.^2+x.^4-((x-r).^3+(x-r).*(y-s).^2+(y-s).^4+(x-r).^2.*(y-s).^2+(x-r).^4))/0.55));
 OTF_OUT1=int(OTF,y,0,x)

[Geoff Hayes]

John - what is the full error message? What are your inputs?

[Youssef Khmou]

Also indefinite integral is not working, the output returns : Warning: Explicit integral could not be found. I think you have to simplify the expression.