Joomla 3.7.2 Error when delete default components

[2dmaster]

Hello, this important, i have error when remove joomla 3.7.2 component SEARCH or FIELDS

too much errors, com_contact not works , in logs i see this error

PHP Fatal error:  Class 'FieldsHelper' not found in /public_html/plugins/system/fields/fields.php on line 214
try to remove standart components!
please report to joomla dev team!

i try to minify cms-pack. but its not succesefull! ↓→↑§

[jenkinhill]

What has this got to do with VirtueMart?