Passing a String to an array.

Hi there I am trying to pass an Input String to an Array at a position queueNext, which is currently zero, and with the loop it increases or increases when u remove a word form the queue, for sum reason I get an error about incompatible types.
here is the chunk of code.
boolean AddToQueue (String value_to_add)
      if (QueueIsFull())
                return false;
      else
           queueArray[queueNext] = value_to_add;
                                                            // add new value to end
           queueNext = (queueNext + 1);
                                                            // move end of queue
           queueEntries ++;                               //now have one more entry
           return true;                                    // return success
}

Could you please post the error message?
BTW:
queueNext = (queueNext + 1);
queueEntries ++;These two statements are equivalent, yet use different syntax.
Another hint:
http://java.sun.com/docs/codeconv/

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