Fix build error

src/app/structures/HostRecord.ts

@@ -1,6 +1,6 @@
 export default class HostRecord {
     public value = '';
-    public type: 'paragraph'|'header1'|'header2'|'header3'|'header4'|'block_code'|'click_link'|'database_ref'|'ul'|'code_ref' = 'paragraph';
+    public type: 'paragraph'|'header1'|'header2'|'header3'|'header4'|'block_code'|'click_link'|'database_ref'|'ul'|'code_ref'|'file_ref' = 'paragraph';
 
     public CreatedAt: string;
     public PageId: string;