My website is damage

Dear Drupal 8.4 friends.

My site is damaged frequently. I have not been able to advance. every time I install or try to install a theme, then the browser shows the following:

The website encountered an unexpected error. Please try again later. </ Br> </ br> <em class = “placeholder”> InvalidArgumentException </ em>: Field is unknown. in <em class = “placeholder”> Drupal Core Entity ContentEntityBase-> getTranslatedField () </ em> (line <em class = “placeholder”> 509 </ em> of <em class = “placeholder”> core / lib / Drupal / Core / Entity / ContentEntityBase.php </ em>). website encountered an unexpected error. Please try again later. </ Br> </ br> <em class = “placeholder”> InvalidArgumentException </ em>: Field is unknown. in <em class = “placeholder”> Drupal Core Entity ContentEntityBase-> getTranslatedField () </ em> (line <em class = “placeholder”> 509 </ em> of <em class = “placeholder”> core / lib / Drupal / Core / Entity / ContentEntityBase.php </ em>).

Thank in advance for your Help.


Source: https://www.drupal.org/taxonomy/term/22/feed