What was the problem in Sylvester and the Magic Pebble?

The problem was that Sylvester is trapped as a rock. Sylvester is a name of a donkey who is from a fictional community called Oatsdale. He collects pebbles of different shapes and colors. On a fine day, he comes across a magical pebble that is able to grant wishes. Soon after finding the pebble, he comes in contact with a lion. In order to save himself, he wishes to become a rock.

As a result of that, the pebble falls off, and is not in contact with him anymore. He is unable to revert back into his original for as the pebble must be in contact with him to grant a wish. The rest of the story revolves around the struggles that he has to endure.