The example data is as follows:

data = RandomInteger[{0, 50}, {50, 4}];

I have defined a distance function myself (as shown below), but the response cannot be computed (FindClusters::wrgdist: The distance function dist cannot be computed on the data. ); how should I modify it?

dist[{x1_, x2_, x3_, x4_}, {y1_, y2_, y3_, y4_}] := 
  N@Norm[#] &@
       Flatten@{Abs@(If[#[[2]] != 0, #[[1]]/#[[2]], 
            10000@#[[1]]]), #[[3]]} &@{Differences[{#[[1, 1]], #[[2, 
          1]]}], Differences[{#[[1, 2]], #[[2, 2]]}], #[[2, 
        1]]} &@{{x3, x4}, {y3, y4}};

FindClusters[data, 2, DistanceFunction -> dist]