it worked normally until i reinstalled yesterday

[shanhai3000]

jupyterlab 1.2.6

Failed validating settings (@jupyterlab/extensionmanager-extension:plugin): Additional properties are not allowed ('disclaimed' was unexpected)

Failed validating 'additionalProperties' in schema:
    {'additionalProperties': False,
     'description': 'Extension manager settings.',
     'jupyter.lab.setting-icon-class': 'jp-SettingsIcon',
     'jupyter.lab.setting-icon-label': 'Extension Manager',
     'properties': {'enabled': {'default': False,
                                'description': 'Enables extension manager '
                                               '(requires Node.js/npm).\n'
                                               'WARNING: installing '
                                               'untrusted extensions may '
                                               'be unsafe.',
                                'title': 'Enabled Status',
                                'type': 'boolean'}},
     'title': 'Extension Manager',
     'type': 'object'}

On instance:
    {'disclaimed': False}