Thank you for your quick response, I tried replacing as you said but still I am getting errors. The script is :
#!/bin/ksh

awk -F"<tab>" 'NR>=3 {
if ( $2 ~ /^ *$/ ) printf("102")
if ( $4 ~ /^ *$/ ) printf("104)
printf("\n")
}' $1

Errors I am getting:
$ test7 test1.txt
awk: newline in string near line 3
awk: syntax error near line 4
awk: illegal statement near line 4