No Shipping Options Available

Everything was working fine up until a few days ago. Now everyone who tries to checkout receives a message saying no shipping options are available. I have updated to the latest version of the plugin and I have left the User ID field empty like you suggested to someone else having a similar problem.

`array (
  'error' => 'API request HTTP error. Data: {
    "service": "ONLINE",
    "response_type": "array",
    "response": {
        "headers": {},
        "body": "You do not have permission to access this page\\nIf you have found this page in error, please contact support\\nReference:22905530535690896001168037354649435606720034968299102359",
        "response": {
            "code": 401,
            "message": "Unauthorized"
        },
        "cookies": [],
        "filename": null,
        "http_response": {
            "data": null,
            "headers": null,
            "status": null
        }
    }
}.',
  'rates' => NULL,
  'settings' => 
  array (
    'props' => 
    array (
      'plugin_id' => 'woocommerce_',
      'id' => 'usps_simple',
      'errors' => 
      array (
      ),
      'data' => 
      array (
      ),
      'supports' => 
      array (
        0 => 'settings',
      ),
      'method_title' => 'USPS Simple',
      'method_description' => 'Shows live USPS domestic rates on checkout',
      'enabled' => 'yes',
      'title' => 'USPS Simple',
      'rates' => 
      array (
      ),
      'tax_status' => 'taxable',
      'fee' => NULL,
      'minimum_fee' => NULL,
      'instance_id' => 0,
      'instance_form_fields' => 
      array (
      ),
      'instance_settings' => 
      array (
      ),
      'availability' => NULL,
      'countries' => 
      array (
      ),
      'method_order' => NULL,
      'has_settings' => NULL,
      'settings_html' => NULL,
      'sender' => '65714',
      'commercialRates' => true,
      'groupByWeight' => true,
      'apiEndpoint' => 'https://secure.shippingapis.com/ShippingAPI.dll',
      'apiUserId' => '891000005749',
    ),
    'settings' => 
    array (
      'enabled' => 'yes',
      'sender' => '',
      'user_id' => '',
      'commercial_rate' => 'yes',
      'group_by_weight' => 'yes',
      'express_mail' => '',
      't_express_mail' => 'Express',
      'express_mail_3' => 'no',
      'express_mail_2' => 'no',
      'express_mail_23' => 'no',
      'priority_mail' => '',
      't_priority_mail' => 'Priority Mail',
      'priority_mail_1' => 'yes',
      'priority_mail_33' => 'no',
      'priority_mail_18' => 'no',
      'priority_mail_47' => 'no',
      'priority_mail_48' => 'no',
      'priority_mail_49' => 'no',
      'priority_mail_50' => 'no',
      'first_class' => '',
      't_first_class' => '',
      'first_class_0A' => 'no',
      'first_class_0B' => 'no',
      'first_class_0C' => 'no',
      'first_class_0D' => 'no',
      'first_class_12' => 'no',
      'first_class_15' => 'no',
      'first_class_19' => 'no',
      'first_class_0E' => 'no',
      'first_class_61' => 'no',
      'first_class_53' => 'no',
      'first_class_78' => 'no',
      'standard_post' => '',
      't_standard_post' => 'USPS Retail Ground',
      'standard_post_4' => 'no',
      'media_mail' => '',
      't_media_mail' => '',
      'media_mail_6' => 'no',
      'library_mail' => '',
      't_library_mail' => '',
      'library_mail_7' => 'no',
      't_ground_advantage' => '',
      'ground_advantage_default' => 'yes',
    ),
  ),
  'package' => 
  array (
    'contents' => 
    array (
      'd645920e395fedad7bbbed0eca3fe2e0' => 
      array (
        'key' => 'd645920e395fedad7bbbed0eca3fe2e0',
        'product_id' => 40,
        'variation_id' => 0,
        'variation' => 
        array (
        ),
        'quantity' => 1,
        'data_hash' => 'b5c1d5ca8bae6d4896cf1807cdf763f0',
        'line_tax_data' => 
        array (
          'subtotal' => 
          array (
          ),
          'total' => 
          array (
          ),
        ),
        'line_subtotal' => 32.0,
        'line_subtotal_tax' => 0.0,
        'line_total' => 32.0,
        'line_tax' => 0.0,
        'product' => 
        array (
          'name' => 'BA-1 Drug Detection and Identification Kit, Basic',
          'slug' => 'ba-1-drug-detection-and-identification-kit-basic',
          'price' => '32',
          'regular_price' => '32',
          'sale_price' => '',
          'weight' => '0.50625 lbs',
          'weight_lbs' => 0.50625,
          'dimensions' => '6 x 4 x 2.0125 in',
          'dimensions_in' => '6 x 4 x 2.0125',
        ),
      ),
      '107efec915fb89ceff6c0f0e53e69b54' => 
      array (
        'key' => '107efec915fb89ceff6c0f0e53e69b54',
        'product_id' => 80,
        'variation_id' => 261,
        'variation' => 
        array (
          'attribute_tests-to-include' => 'Meth, Cocaine, Amphetamine/Opiate',
        ),
        'quantity' => 1,
        'data_hash' => 'e8cfa0597e95f5a72c80239a4232cca2',
        'line_tax_data' => 
        array (
          'subtotal' => 
          array (
          ),
          'total' => 
          array (
          ),
        ),
        'line_subtotal' => 50.0,
        'line_subtotal_tax' => 0.0,
        'line_total' => 50.0,
        'line_tax' => 0.0,
        'product' => 
        array (
          'name' => 'NARTEC Triple 10 (30 Tests) - Meth, Cocaine, Amphetamine/Opiate',
          'slug' => 'nartec-triple-10-30-tests-meth-cocaine-amphetamine-opiate',
          'price' => '50',
          'regular_price' => '50',
          'sale_price' => '',
          'weight' => '1 lbs',
          'weight_lbs' => 1.0,
          'dimensions' => '6 x 4 x 4 in',
          'dimensions_in' => '6 x 4 x 4',
        ),
      ),
    ),
    'contents_cost' => 82.0,
    'applied_coupons' => 
    array (
    ),
    'user' => 
    array (
      'ID' => 1,
    ),
    'destination' => 
    array (
      'country' => 'US',
      'state' => 'MO',
      'postcode' => '65714',
      'city' => 'Nixa',
      'address' => '',
      'address_1' => '',
      'address_2' => '',
    ),
    'cart_subtotal' => '82',
    'rates' => 
    array (
    ),
  ),
  'requests' => 
  Dgm\UspsSimple\Calc\Pair::__set_state(array(
     'online' => 'API=RateV4&XML=
<RateV4Request USERID="891000005749">
    <Revision>2</Revision>
    <Package ID="group_by_weight_0:1:0:0:0:0">
        <Service>ONLINE</Service>
        <ZipOrigination>65714</ZipOrigination>
        <ZipDestination>65714</ZipDestination>
        <Pounds>1</Pounds>
        <Ounces>8.10</Ounces>
        <Container/>
        <Width>0</Width>
        <Length>0</Length>
        <Height>0</Height>
        <Girth>0</Girth>
        <Machinable>true</Machinable>
        <ShipDate>21-Nov-2023</ShipDate>
    </Package>
</RateV4Request>
',
     'standard' => NULL,
  )),
  'request' => 
  Dgm\UspsSimple\Calc\Request::__set_state(array(
     'apiUserId' => '891000005749',
     'package' => 
    Dgm\UspsSimple\Calc\Package::__set_state(array(
       'orig' => 
      Dgm\UspsSimple\Calc\Area::__set_state(array(
         'countryCode' => 'US',
         'zipCode' => '65714',
      )),
       'dest' => 
      Dgm\UspsSimple\Calc\Area::__set_state(array(
         'countryCode' => 'US',
         'zipCode' => '65714',
      )),
       'items' => 
      array (
        'd645920e395fedad7bbbed0eca3fe2e0' => 
        Dgm\UspsSimple\Calc\Item::__set_state(array(
           'product' => 
          Dgm\UspsSimple\Calc\Product::__set_state(array(
             'weight' => 0.50625,
             'dim' => 
            Dgm\UspsSimple\Calc\Dim::__set_state(array(
               'length' => 6.0,
               'width' => 4.0,
               'height' => 2.0125,
            )),
          )),
           'quantity' => 1,
        )),
        '107efec915fb89ceff6c0f0e53e69b54' => 
        Dgm\UspsSimple\Calc\Item::__set_state(array(
           'product' => 
          Dgm\UspsSimple\Calc\Product::__set_state(array(
             'weight' => 1.0,
             'dim' => 
            Dgm\UspsSimple\Calc\Dim::__set_state(array(
               'length' => 6.0,
               'width' => 4.0,
               'height' => 4.0,
            )),
          )),
           'quantity' => 1,
        )),
      ),
    )),
     'services' => 
    Dgm\UspsSimple\Model\Services::__set_state(array(
       'families' => 
      array (
        1 => 
        Dgm\UspsSimple\Model\ServiceFamily::__set_state(array(
           'id' => 'priority_mail',
           'title' => 'Priority Mail',
           'sort' => 1,
           'services' => 
          array (
            0 => 
            Dgm\UspsSimple\Model\RegularService::__set_state(array(
               'family' => NULL,
               'title' => 'Priority Mail',
               'alwaysUseCommercialRate' => NULL,
               'enabled' => true,
               'id' => '1',
            )),
          ),
        )),
        3 => 
        Dgm\UspsSimple\Model\ServiceFamily::__set_state(array(
           'id' => 'ground_advantage',
           'title' => 'USPS Ground Advantage',
           'sort' => 3,
           'services' => 
          array (
            0 => 
            Dgm\UspsSimple\Model\GroundAdvantage::__set_state(array(
               'family' => NULL,
               'title' => 'USPS Ground Advantage',
               'alwaysUseCommercialRate' => NULL,
               'enabled' => true,
               'id' => 'default',
            )),
          ),
        )),
      ),
       'retailGroundEnabled' => false,
    )),
     'groupByWeight' => true,
     'commercialRates' => true,
  )),
  'responses' => NULL,
  'combinedResponse' => NULL,
)`