Recursive pathfinding Index exceeds matrix dimensions

The function is supposed to return a path for a mouse to go, which is one of the four corners of the maze. I am trying with recursive. B is a 2 dimensonal metrix, probe is [x y] vector and prevProbe start out as [0 0] This is an error messege I recive on both err1, err2, err3 and err4. identifier: 'MATLAB:badsubscript' message: 'Index exceeds matrix dimensions.' cause: {} stack: [724x1 struct]

    function [ route done ] = PathFinder( B, probe, prevProbe )
%PATHFINDER Summary of this function goes here
%   Detailed explanation goes here
done = false;
route = [];
e1 = [1 1];
e2 = [size(B,1) 1];
e3 = [1 size(B,2)];
e4 = [size(B,1) size(B,2)];
% = 1 (right), 2 (left), 3 (up), 4 (down)
if isequal(probe, e1) | isequal(probe, e2) | isequal(probe, e3) | isequal(probe, e4)
        done = true
        return;
        route
end
try
    if B(probe(1),probe(2)+1) == 0
        [route, done] = PathFinder(B, [probe(1) probe(2)+1], probe);
        if done
            temp = [route getDir(probe, prevProbe)];
            route = temp(1);
            done = temp(2);
            return;
        end
    end
catch err
    err
end
try
    if B(probe(1)+1,probe(2)) == 0
        [route, done] = PathFinder(B, [probe(1)+1 probe(2)], probe);
        if done
            temp = [route getDir(probe, prevProbe)];
            route = temp(1);
            done = temp(2);
            return;
        end
    end
    catch err
    err
end
try
    if B(probe(1),probe(2)-1) == 0
        [route, done]= PathFinder(B, [probe(1) probe(2)-1], probe);
        if done
            temp = [route getDir(probe, prevProbe)];
            route = temp(1);
            done = temp(2);
            return;
        end
    end
    catch err
    err
end
try
    if B(probe(1)-1,probe(2)) == 0
        [route, done] = PathFinder(B, [probe(1)-1 probe(2)], probe);
        if done
            temp = [route getDir(probe, prevProbe)];
            route = temp(1);
            done = temp(2);
            return;
        end
    end
catch err
    err
end
end
% = 1 (right), 2 (left), 3 (up), 4 (down)
function [dir] = getDir(probe, prevProbe)
            temp = probe - prevProbe;
            if isequal(temp,[1 0]);
                dir = 1;
                return;
            elseif isequal(temp,[0 1]);
                dir = 3;
                return;
            elseif isequal(temp,[-1 0]);
                dir = 2;
                return;
            elseif isequal(temp,[0 -1]);
                dir = 4;
                return;
            end
end