[randomkid88]

An example of this would be something like

pawn Код:

{
     Function 1;
     return 1;
     Function 2;
}

You would get this error because Function 2 would never be executed (aka "unreachable") because you returned a value already. Look for something like this, where you return a value but then try to execute something else within the same bracket.
This, however, is acceptable:

pawn Код:

{
     {
          Function 1;
          return 1;
     }
     Function 2;
}

Or just post your code