troubles starting eclipse 3

sh start_eclipse.sh
Error: No MANIFEST.MF or Main-Class: in MANIFEST.MF found in 
/opt/eclipse/startup.jar

/usr/bin/java-sablevm --showversion
SableVM version 1.1.9
- compile date and time: 2005-01-21 04:10:55 UTC
- gcc version: 3.3.5 (Debian 1:3.3.5-6)

cat start_eclipse.sh
#!/bin/sh
  JAVA=/usr/bin/java-sablevm
  ECLIPSE_HOME=/opt/eclipse

  #########################################################################
  # You should NOT need to modify anything below this line.               #
  #########################################################################
  if [ ! -x $JAVA -o ! -f $ECLIPSE_HOME/startup.jar ]; then
    echo "Error: 'java' command or Eclipse's startup.jar not found!"
    echo "  JAVA=$JAVA"
    echo "  ECLIPSE_HOME=$ECLIPSE_HOME"
    echo "  Check the directories in $0 script and try again!"
    exit 1
  fi

  JAVACMD="$JAVA -Dosgi.locking=none"

  for one in `find $ECLIPSE_HOME -name \*.so | sed 
's/^\(.*\)\/[^\/]*$/\1/g' |sort|uniq`; do
    LD_LIBRARY_PATH="$LD_LIBRARY_PATH":$one
  done

  export LD_LIBRARY_PATH JAVACMD ECLIPSE_HOME JAVA
  exec $JAVACMD -jar $ECLIPSE_HOME/startup.jar -os linux -ws gtk -consolelog
-- 
Regards,

Marius - linux admin