unable to load unity namespace

last week i moving from using visual studio to vsCode (because tabNine), and i already go to edit =>prefab=>external ide, i also already download the extension![alt text][1] but it cant load UnityEnggine namespace. i dint move the file or anything, just normal script like usual. but vsCode didnot reconize like, transform, texture, gameObject, and all tha unnity namspace have. so how do i fix this? [1]: /storage/temp/179806-e.png