Drupal version was 8.6.2 and moved to new server. When doing the core update , getting an error like below.

 Problem 1
- remove drupal/drupal No version set (parsed as 1.0.0)|remove drupal/core 8.6.3
- don't install drupal/core 8.6.2|remove drupal/drupal No version set (parsed as 1.0.0)
- don't install drupal/core 8.6.3|remove drupal/drupal No version set (parsed as 1.0.0)
- don't install drupal/core 8.6.x-dev|remove drupal/drupal No version set (parsed as 1.0.0)
- don't install drupal/core 8.7.x-dev|remove drupal/drupal No version set (parsed as 1.0.0)
- don't install drupal/core 8.6.3|remove drupal/drupal No version set (parsed as 1.0.0)
- Installation request for drupal/drupal No version set (parsed as 1.0.0) -> satisfiable by drupal/drupal[No version set (parsed as 1.0.0)].
- Installation request for drupal/core ^8.6.2 -> satisfiable by drupal/core[8.6.2, 8.6.3, 8.6.x-dev, 8.7.x-dev]

i have tried the composer install by removing composer.lock, vendor and core. Still getting same error.

Updated with my composer.json

{
"name": "drupal/drupal",
"description": "Drupal is an open source content management platform powering millions of websites and applications.",
"type": "project",
"license": "GPL-2.0+",
"require": {
    "composer/installers": "^1.0.24",
    "wikimedia/composer-merge-plugin": "^1.4",
    "drupal/core": "^8.6.2",
    "drush/drush": "^9.2",
    "drupal/s3fs": "^3.0",
    "drupal/csv_serialization": "^1.4"
},
"minimum-stability": "dev",
"prefer-stable": true,
"config": {
    "preferred-install": "dist",
    "autoloader-suffix": "Drupal8"
},
"extra": {
    "_readme": [
        "By default Drupal loads the autoloader from ./vendor/autoload.php.",
        "To change the autoloader you can edit ./autoload.php.",
        "This file specifies the packages.drupal.org repository.",
        "You can read more about this composer repository at:",
        "https://www.drupal.org/node/2718229"
    ],
    "merge-plugin": {
        "include": [
            "core/composer.json"
        ],
        "recurse": false,
        "replace": false,
        "merge-extra": false
    },
    "installer-paths": {
        "core": ["type:drupal-core"],
        "modules/contrib/{$name}": ["type:drupal-module"],
        "profiles/contrib/{$name}": ["type:drupal-profile"],
        "themes/contrib/{$name}": ["type:drupal-theme"],
        "drush/contrib/{$name}": ["type:drupal-drush"],
        "modules/custom/{$name}": ["type:drupal-custom-module"],
        "themes/custom/{$name}": ["type:drupal-custom-theme"]
    }
},
"autoload": {
    "psr-4": {
        "Drupal\\Core\\Composer\\": "core/lib/Drupal/Core/Composer"
    }
},
"scripts": {
    "pre-autoload-dump": "Drupal\\Core\\Composer\\Composer::preAutoloadDump",
    "post-autoload-dump": [
      "Drupal\\Core\\Composer\\Composer::ensureHtaccess"
    ],
    "post-package-install": "Drupal\\Core\\Composer\\Composer::vendorTestCodeCleanup",
    "post-package-update": "Drupal\\Core\\Composer\\Composer::vendorTestCodeCleanup"
},
"repositories": [
    {
        "type": "composer",
        "url": "https://packages.drupal.org/8"
    }
]

}

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