News Type Missed in the Admin sidebar WP error

I try to set up the instructor dashboard and the Members  News Widget , Unfortunately when i click on Add news i get a Wp error "<span style="color: #444444; font-family: 'Open Sans', sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 21px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; float: none; background-color: #ffffff;">Invalid post type" also the news tab in the admin seccion is missed  ( see screens) </span>