Please help with widget.php

Hi

Can anyone please help? I removed some code on the widget.php and I got this error: Fatal error: Call to undefined function phpget_template_part() in /home/centenia/public_html/wp-content/themes/ArtSee/includes/widgets.php on line 1
now I navigate to any page because I keep getting the same error. I did some backup on the notepad of the code I remove

Please help ASAP client needs the website before end of business today

THank you
Phumlani