This is my code:

```
def is_prime(x):
if x>2:
for n in range (2,x-1):
if x % n == 0:
return False
else:
return True
elif x==2:
return True
elif x==0 or x==1:
return False}
```

The error says : Oops, try again.

Your function fails on is_prime(3). It returns None when it should return True.