Skipping acquire of configured file 'multiverse/binary-arm64/Packages' as repository 'https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 InRelease' doesn't support architecture 'arm64'

I am getting the same error on Ubuntu 18.04. On running uname -m I get x86_64
Why does source repo mentions arm64. If I change that to x86_64, will that fix it?