sed in shell script

sed: -e expression #1, char 14: unknown option to `s'

line="Include /2"
rep=""
sed -e "s/${line}/${rep}/g" /root/new_scripts/a.conf

sed -e "s|${line}|${rep}|g" /root/new_scripts/a.conf 

References :

bash - replace a string in file using shell script - Stack Overflow