Issues with if staements (Again) :/

i don't know why this doesn't work :/ when i run the script i get this error :

UnityEngine.Random.Range (Int32 min, Int32 max) (at /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/RandomBindings.gen.cs:57)

here is the script :

 function Roam() {
     chance = Random.Range(0, 100);
     if(chance >= 0 && chance <= 25 && last != 1) {
         Debug.Log("1");
         last = 1;
     } else {
         Roam();
     }
     if(chance >= 26 && chance <= 50 && last != 2) {
         Debug.Log("2");
         last = 2;
     } else {
         Roam();
     }
     if(chance >= 51 && chance <= 75 && last != 3) {
         Debug.Log("3");
         last = 3;
     } else {
         Roam();
     }
     if(chance >= 76 && chance <= 100 && last != 4) {
         Debug.Log("4");
         last = 4;
     } else {
         Roam();
     }
 }