/obj/screen --> /atom/movable/screen

code/modules/mob/living/carbon/alien/alien.dm

@@ -78,7 +78,7 @@
 
 	if(bodytemperature > BODYTEMP_HEAT_DAMAGE_LIMIT)
 		//Body temperature is too hot.
-		throw_alert("alien_fire", /obj/screen/alert/alien_fire)
+		throw_alert("alien_fire", /atom/movable/screen/alert/alien_fire)
 		switch(bodytemperature)
 			if(360 to 400)
 				apply_damage(HEAT_DAMAGE_LEVEL_1, BURN)

code/modules/mob/living/carbon/alien/humanoid/caste/hunter.dm

@@ -7,7 +7,7 @@
 	meleeKnockdownPower = 75
 	meleeSlashHumanPower = 20
 	meleeSlashSAPower = 45
-	var/obj/screen/leap_icon = null
+	var/atom/movable/screen/leap_icon = null
 
 /mob/living/carbon/alien/humanoid/hunter/create_internal_organs()
 	internal_organs += new /obj/item/organ/alien/plasmavessel/small

code/modules/mob/living/carbon/alien/life.dm

@@ -20,7 +20,7 @@
 
 	if(Toxins_pp > tox_detect_threshold) // Detect toxins in air
 		adjustPlasma(breath.get_moles(GAS_PLASMA)*250)
-		throw_alert("alien_tox", /obj/screen/alert/alien_tox)
+		throw_alert("alien_tox", /atom/movable/screen/alert/alien_tox)
 
 		toxins_used = breath.get_moles(GAS_PLASMA)
 

code/modules/mob/living/carbon/alien/organs.dm

@@ -141,7 +141,7 @@
 	owner.stuttering += 30
 
 	recent_queen_death = 1
-	owner.throw_alert("alien_noqueen", /obj/screen/alert/alien_vulnerable)
+	owner.throw_alert("alien_noqueen", /atom/movable/screen/alert/alien_vulnerable)
 	addtimer(CALLBACK(src, .proc/clear_queen_death), QUEEN_DEATH_DEBUFF_DURATION)