ksh: syntax error near unexpected token `done' - unix

Question

I am trying to write a script to output lines which fulfill a certain criteria into a new .txt file, trying to combined unix and awk
been googling but keep getting this error:syntax error near unexpected token `done'
Filename="bishan"
file="659.A"
while IFS= read line
do
cat $Filename.txt | awk '{ otherSubNo = substr($0,73,100);gsub(/
/,"",otherSubNo); if(length(otherSubNo)>8){ print "Subscriber Number is
",": ",substr($0,1,20)," Other Subscriber Number is ", " :
",substr($0,73,100) }}'| wc -l >> $Filename.txt
done <"$file"
example of 659.A is as follows:
This is the first line of the 659.a file:
6581264562 201611050021000000002239442239460000000019010000010081866368
00C0525016104677451 100C 0 0000
0111000 000000000000000000006598540021 01010000000000659619778001010000
000000659854000300000000000000000000 004700001
Please help, I have been googling about this but no avail

Answer 1

I was able to reproduce the specified error, albeit only with close approximation, by typing the script in notepad (windows) and testing it in cygwin.
script.sh:
while read myline
do
echo $myline
done
In ksh:
~> /usr/bin/ksh ./script.sh
: not found
./script.sh[7]: syntax error: 'done' unexpected
In bash:
~> /usr/bin/bash ./script.sh
./script.sh: line 2: $'\r': command not found
./script.sh: line 6: syntax error near unexpected token `done'
./script.sh: line 6: `done'
The said error (at least, in my case) is because of the CRLF characters. When I copy-paste the code to cygwin, the CRLF turns to LF (along with all invisible control characters that get lost), thus making the error disappear.