Linux Startup script error

I am having a error and i dont see anything wrong

Code:

#!/bin/bash
 
echo "===AutoWalls Startup Script V 1.0 By Jkush321==="
 
if [ -d "custom1" ]; then
echo "Found custom1..."
else
echo "custom1 directory missing! Download the walls 1 and name it custom1"
exit 0
fi
if [ -d "custom2" ]; then
echo "Found custom2..."
else
echo "custom2 directory missing! Download the walls 2 and name it custom2"
exit 0
fi
if [ -d "custom" ]; then
echo "Found custom..."
else
echo "custom not found... copying"
mkdir custom
cp -r custom1/* custom
fi
 
start() {
echo "Starting Server..."
rm -rf walls
mkdir walls
cp -r custom/* walls
java -Xms640M -Xmx640M -jar bukkit.jar
start
}
start

And the error is
===AutoWalls Startup Script V 1.0 By Jkush321===
: not found:
start.sh: 33: Syntax error: end of file unexpected (expecting "then")