Permission denied (publickey): SSH into EC2 instance

I created a terraform configuration to launch an EC2 instance. My configuration is

    resource "aws_volume_attachment""ebs_att" {      device_name = "/dev/sdh"      volume_id   = "${aws_ebs_volume.newVolume.id}"      instance_id = "${aws_instance.web.id}"    }    resource "aws_instance""web" {      ami           = "ami-2757f631"      instance_type = "t2.micro"      availability_zone = "us-east-1a"      vpc_security_group_ids=["${aws_security_group.instance.id}"]      key_name="KeyPairVirginia"      tags {        Name = "HelloWorld"      }    }    resource "aws_ebs_volume""newVolume" {      availability_zone = "us-east-1a"      size              = 4      encrypted=true      type="standard"      kms_key_id="arn:aws:kms:us-east-1:257844712457:key/${data.aws_kms_key.ebskey.id}"      tags {        Name = "HelloWorld"      }    }

It provisioned an EC2 instance with a root volume and one additional EBS volume. I already have downloaded the specified key pair and did chmod 400 permission task. Now when I try to SSH into the instance it gives me Permission Denied (Public Key) error.

Why is this? Did I miss to specify any configuration in the terraform script?