diff --git a/commons-serialize-generator/src/main/java/io/gitlab/jfronny/commons/serialize/generator/SerializeGeneratorProcessor.java b/commons-serialize-generator/src/main/java/io/gitlab/jfronny/commons/serialize/generator/SerializeGeneratorProcessor.java
index 94e6903..252a036 100644
--- a/commons-serialize-generator/src/main/java/io/gitlab/jfronny/commons/serialize/generator/SerializeGeneratorProcessor.java
+++ b/commons-serialize-generator/src/main/java/io/gitlab/jfronny/commons/serialize/generator/SerializeGeneratorProcessor.java
@@ -115,7 +115,7 @@ public class SerializeGeneratorProcessor extends AbstractProcessor2 {
                                     case "adapter" -> {
                                         if (bld.adapter != null) throw new IllegalArgumentException("Duplicate annotation parameter: adapter");
                                         if (value.getValue() instanceof TypeMirror tm) bld.adapter = tm;
-                                        else throw new IllegalArgumentException("Unexpected value type: " + value.getValue().getClass() + " (with value" + value.getValue() + ")");
+                                        else throw new IllegalArgumentException("Unexpected value type: " + value.getValue().getClass() + " (with value " + value.getValue() + ") on " + element);
                                     }
                                     case "nullSafe" -> {
                                         if (bld.nullSafe != null) throw new IllegalArgumentException("Duplicate annotation parameter: nullSafe");