Errors in "e-Commerce configuration -> Location"

On admin/ecsettings/location screen i have

warning: Invalid argument supplied for foreach() in /home/immorta1/public_html/subdomens/site702/includes/form.inc on line 949.
warning: Invalid argument supplied for foreach() in /home/immorta1/public_html/subdomens/site702/includes/form.inc on line 949.
warning: Invalid argument supplied for foreach() in /home/immorta1/public_html/subdomens/site702/includes/form.inc on line 949.
warning: Invalid argument supplied for foreach() in /home/immorta1/public_html/subdomens/site702/includes/form.inc on line 949.

i think maybe this my problem, but i display in store.admin.inc file, in _store_location_settings_form function, this code

// Physical dimensions
$measures = _store_location_measures();
// my code begin
echo '

';
  print_r($measures);
  echo '

';
// my code end

and i see this array

Array
(
[LB] => Array
(
[type] => weight
[name] => Pounds
[factor] => 0.45359237
)

[G] => Array
(
[type] => weight
[name] => Grams
[factor] => 0.001
)

[KG] => Array
(
[type] => weight
[name] => Kilograms
[factor] => 1
)

[OZ] => Array
(
[type] => weight
[name] => Ounces
[factor] => 0.0283495231
)

[IN] => Array
(
[type] => length
[name] => Inches
[factor] => 0.0254
)

[FT] => Array
(
[type] => length
[name] => Feet
[factor] => 0.3048
)

[CM] => Array
(
[type] => length
[name] => Centimetres
[factor] => 0.01
)

[M] => Array
(
[type] => length
[name] => Metres
[factor] => 1
)

[IN2] => Array
(
[type] => area
[name] => Square Inches
[factor] => 2
)

[FT2] => Array
(
[type] => area
[name] => Square Feet
[factor] => 2
)

[CM2] => Array
(
[type] => area
[name] => Square Centimetres
[factor] => 2
)

[M2] => Array
(
[type] => area
[name] => Square Metres
[factor] => 1
)

[IN3] => Array
(
[type] => volume
[name] => Cubic Inches
[factor] => 3
)

[FT3] => Array
(
[type] => volume
[name] => Cubic Feet
[factor] => 3
)

[CM3] => Array
(
[type] => volume
[name] => Cubic Centimetres
[factor] => 3
)

[M3] => Array
(
[type] => volume
[name] => Cubic Metres
[factor] => 1
)

)

BUT

$form['dimensions']['ec_measure_weight'] = array(
'#default_value' => variable_get('ec_measure_weight', 'LB'),
'#description' => t('Default unit measure of weight.'),
'#options' => $measures['weight'],
'#title' => t('Weight'),
'#type' => 'select'
);

$measures['weight'] -> array is NULL

Sorry, maybe this problem have other people or this happens with me only?