MongoDB SSL Enabling/Configuration

I have created self signed Certificated by using openssl and have mongodb.pem(mongodb.key + mongodb.cert) file generated from openssl. Also i have my mongodb-ssl.conf file as follows

storage:
   dbPath: C:\Users\rajshanb\MongoDB\data\db\
net:
   port: 27018 
   bindIp: 127.0.0.1
   ssl:
       Mode = requireSSL
       PEMKeyFile = C:\Users\rajshanb\mongodb.pem
       PEMKeyPassword = rajshanb
       CAFile = C:\Users\rajshanb\client.pem

But when i am trying to start the server from terminal :

C:\Users\rajshanb\MongoDB\mongodb\bin>mongod -f C:\Users\rajshanb\mongodb-ssl.conf
Unrecognized option: net.ssl
try 'mongod --help' for more information

I'm getting above mentioned error. Please help me to identify whether i am missing something in configuration.

I am having installed MongoDB version as :

C:\Users\rajshanb>mongod --version
db version v3.4.6
git version: c55eb86ef46ee7aede3b1e2a5d184a7df4bfb5b5
OpenSSL version: OpenSSL 1.0.1u-fips  22 Sep 2016
allocator: tcmalloc
modules: enterprise
build environment:
    distmod: windows-64
    distarch: x86_64
    target_arch: x86_64