Error when run composer install

[azraidev]

[Composer\Repository\InvalidRepositoryException] Invalid repository data in /Users/xxxx/PhpstormProjects/coreui/vendor/composer/installed.json, packages could not be loaded: [Seld\JsonLint\Parsin gException] "/Users/xxxx/PhpstormProjects/coreui/vendor/composer/installed.json" does not contain valid JSON Parse error on line 2: [ {<<<<<<< HEAD -----^ Expected one of: 'STRING', '}'

[UnderDogg]

There's something seriously wrong with the source you have in that directory.
It looks like you've merged in another branch with a merge conflict in there.
Maybe, just maybe you can rm -rf vendor and then composer install again.
Where did you get the source in that directory from?