Where Did Jesus Meet Simon-Peter and Andrew?

Matthew 4:18-19 As Jesus was walking beside the Sea of Galilee, he saw two brothers, Simon called Peter and his brother Andrew. They were casting a net into the lake, for they were fishermen. "Come, follow me," Jesus said, "and I will make you fishers of men."

John 1:42-43 And he brought him to Jesus. Jesus looked at him and said, "You are Simon son of John. You will be called Cephas" (which, when translated, is Peter). The next day Jesus decided to leave for Galilee. Finding Philip, he said to him, "Follow me."

The chronology is actually fairly easy to re-create. In John 1:35-36, John the Baptist was with his disciples and he informs them that Jesus is the Lamb of God (John 1:36). They remain with Jesus awhile (John 1:37-39). Then Andrew goes and finds Simon-Peter (John 1:40-42). They follow Jesus. The text explains why; Jesus was the Messiah - that is, the Christ (John 1:41). Later, in Matthew 4:18, Jesus was walking by the Sea of Galilee. He observed Simon and Andrew as they were fishing. He then asked them to follow him and they did (Matt. 4:20). So, Andrew and Peter met Jesus, they observed him for a time, and then Andrew and Simeon-Peter were called. Therefore, there is no contradiction.