Error with Jetpack

When I install this plugin and then install jetpack. It will shows this error, event though i deactivated your plugin, but your plugin can still gives error. How your plugin can still run and gives error when i already deactivated it? The only way to resolve is to uninstall your plugin.

Warning	get_class() expects parameter 1 to be object, string given	56	
    wp-content/plugins/debug-functions-time/wp-loader-addition.php:85
    DFTwp_function_name_detect()
    wp-content/plugins/debug-functions-time/wp-loader-addition.php:24
    DFTwp_CALLBACK_FUNCTION_START()
    wp-includes/class-wp-hook.php:293
    apply_filters('jetpack_constant_default_value')
    wp-content/plugins/jetpack/vendor/automattic/jetpack-constants/src/class-constants.php:88
    Automattic\J\Constants::get_constant()
    wp-content/plugins/jetpack/vendor/automattic/jetpack-connection/src/class-tokens.php:391
    Automattic\J\C\Tokens->get_access_token()
    wp-content/plugins/jetpack/vendor/automattic/jetpack-connection/src/class-manager.php:545
    Automattic\J\C\Manager->is_connected()
    wp-content/plugins/jetpack/vendor/automattic/jetpack-connection/src/class-manager.php:95
    Automattic\J\C\Manager::configure()
    wp-content/plugins/jetpack/vendor/automattic/jetpack-config/src/class-config.php:188
    Automattic\J\Config->enable_connection()
    wp-content/plugins/jetpack/vendor/automattic/jetpack-config/src/class-config.php:149
    Automattic\J\Config->ensure_feature()
    wp-content/plugins/jetpack/vendor/automattic/jetpack-config/src/class-config.php:82
    Automattic\J\Config->on_plugins_loaded()
    wp-includes/class-wp-hook.php:298
    do_action('plugins_loaded')
    wp-settings.php:423