jQuery error in admin

Hi,

I’m am getting jQuery error in WP administration pages:
TypeError: $.datepicker is undefined

Link to console error image: https://storage1.static.itmages.com/i/17/1122/h_1511356494_1729327_b68f51cb8c.jpeg

Warning which I get when I try to create backup with BackupBuddy plugin: https://storage5.static.itmages.com/i/17/1122/h_1511356904_5158429_2418ffa406.jpeg

Thanks,
Ivan