This is how my program looks can you please tell me why i am getting errors when i run the script as

$./sandeep.sh
./sandeep_new.sh: line 12: read: `dir?what is the path that you want to find ?': not a valid identifier

./sandeep_new.sh: line 13: read: `dir?Please specify a valid path to search ?': not a valid identifier
./sandeep_new.sh: line 23: syntax error near unexpected token `else'
./sandeep_new.sh: line 23: `else'


#!/bin/ksh

NULL=""; export NULL #If the user specifies NULL value

echo "The cvs file script has started............................................"
read dir?"what is the path that you want to find ?"
read dir?"Please specify a valid path to search ?"

if [ "$dir" = "$NULL" ]; then
echo "Not a Valid path or path not specified by user,Do you wish to continue:"[Y/N]?""
read ans
case "$ans" in
y*|Y*)

read log?"Please specify a valid log file(ex:/logs/sandeep.log) that needs to created that will dump the results on the log file ?"

else
n*|N*)
echo exiting from program...;;
esac

if [ "$log" == "$NULL" ]; then
echo "Not a Valid path or path not specified by user,Do you wish to continue:"[Y/N]?""
read ans
case "$ans" in
y*|Y*)

read days?"Please specify the valid number as the number of days for the serach ?"
if [ "$days" == "$NULL" ]; then
echo "Not a Valid path or path not specified by user,Do you wish to continue:"[Y/N]?""

read ans
case "$ans" in
y*|Y*)

find $dir -ctime +$days -type f -exec ls -l {} \; > $log

else
n*|N*)
echo exiting from program...;;
esac


fi
fi

fi



exit