Uncaught ReferenceError: OCA is not defined in nextcloud

While I am configuring object storage in the next cloud it will show an error like Uncaught ReferenceError: OCA is not defined

Added object storage parameter in config.php file. Below is my config file.

    'objectstore' => array (
        'class' => 'OC \\ Files \\ ObjectStore \\ S3',
        'arguments' => array (
            'bucket' => 'abcbucket',
             'autocreate' => true,
             'key' => '09KDDKXI8783343FSDX34',
             'secret' => 'SDF987SD9F879dsf897DSF98798798DSF98dsf98798DSF',
             'hostname' => 's3.wasabisys.com',
             'port' => 443,
             'use_ssl' => true,
             'region' => 'us-east-1',
             // required for some non amazon s3 implementations
             'use_path_style' => true
        ),
      ),

How can I fix this problem in the following light?