Custom Field type plugins issue

[ntifosiaw]

Hello, VM 3.0.12, Joomla 3.4.8. Trying to create custom field  - type plugins, but i can't get select a plug-in form, it's not appear at the bottom. What can it be?

System message:
vmdebug setParameterableByFieldType before trigger plgVmGetTablePluginParams Var1:
0
Var2: 0
Var3: custom_params
Var4: 0
vmdebug onStoreInstallPluginTable return false, given $name Array plg name specification
vmdebug data: Var1:
Array
(
    [custom_title] => Stockable custom fields
    [show_title] => 1
    [published] => 1
    [custom_parent_id] => 0
    [is_cart_attribute] => 1
    [is_input] => 1
    [custom_desc] =>
    [custom_value] => stockable

    [custom_tip] =>
    [layout_pos] => addtocart
    [admin_only] => 1
    [is_hidden] => 1
    [ordering] => 0
    [view] => custom
    [task] => save
    [5d48361e4357b10455cbeb11e533236b] => 1
    [custom_jplugin_id] => 0
    [custom_element] => 0
    [field_type] => E
    [virtuemart_custom_id] => 115
    [option] => com_virtuemart
    [virtuemart_vendor_id] => 1
)
vmdebug vmTime: VirtueMartControllerCustom Finished task custom: 0.0998978614807129