diff --git a/main/src/main/resources/lang/en-US/strings.yml b/main/src/main/resources/lang/en-US/strings.yml
index 9236585c2..8106f9899 100644
--- a/main/src/main/resources/lang/en-US/strings.yml
+++ b/main/src/main/resources/lang/en-US/strings.yml
@@ -250,6 +250,7 @@ stageEditorObjectiveOverrideCleared: "Objective display override cleared."
 stageEditorDeliveryAddItem: "Add item"
 stageEditorDeliveryNPCs: "Set NPC IDs"
 stageEditorDeliveryMessages: "Set delivery messages"
+stageEditorNotSolid: "is not a solid block!"
 stageEditorInvalidBlockName: "is not a valid block name!"
 stageEditorInvalidEnchantment: "is not a valid enchantment name!"
 stageEditorInvalidNPC: "is not a valid NPC ID!"