[muscript] Adjust Get.get exception

muscript/src/main/java/io/gitlab/jfronny/muscript/compiler/expr/Get.java

@@ -23,6 +23,6 @@ public class Get extends Expr.ObjectExpr {
         } else if (left instanceof OList l) {
             return l.get(name.asNumberExpr().get(dataRoot, dataRoot).intValue());
         }
-        throw new IllegalArgumentException("Name is not of a valid type");
+        throw new IllegalArgumentException("The element to get value \"" + name.asStringExpr().get(dataRoot, dataRoot) + "\" from is not of a valid type");
     }
 }