diff --git a/opcua-core/src/lib.rs b/opcua-core/src/lib.rs
index a4b28a32..14f8ad6e 100644
--- a/opcua-core/src/lib.rs
+++ b/opcua-core/src/lib.rs
@@ -64,7 +64,6 @@ pub mod constants {
 
 pub mod comms;
 pub mod config;
-pub mod errors;
 pub mod handle;
 
 pub mod messages;
diff --git a/opcua-types/Cargo.toml b/opcua-types/Cargo.toml
index ce212027..c654fbe6 100644
--- a/opcua-types/Cargo.toml
+++ b/opcua-types/Cargo.toml
@@ -35,7 +35,6 @@ struson = { workspace = true, optional = true }
 
 opcua-xml = { path = "../opcua-xml", optional = true }
 
-
 [dev-dependencies]
 opcua-types = { path = ".", features = ["xml", "json"] }
 serde_json = { workspace = true }
diff --git a/opcua-core/src/errors.rs b/opcua-types/src/errors.rs
similarity index 71%
rename from opcua-core/src/errors.rs
rename to opcua-types/src/errors.rs
index 6c9a854c..8f4c05f8 100644
--- a/opcua-core/src/errors.rs
+++ b/opcua-types/src/errors.rs
@@ -3,15 +3,19 @@
 
 //!  Rust OpcUa specific errors
 
-use opcua_types::VariantScalarTypeId;
 use thiserror::Error;
 
+use crate::VariantScalarTypeId;
+
 /// Rust OpcUa specific errors
 #[allow(missing_docs)]
 #[derive(Error, Debug)]
 pub enum OpcUAError {
     #[error("Received an unexpected variant type")]
-    UnexpectedVariantType(Option<VariantScalarTypeId>),
+    UnexpectedVariantType {
+        variant_id: Option<VariantScalarTypeId>,
+        message: String,
+    },
     #[error("The requested namespace does not exists")]
     NamespaceDoesNotExist(String),
 }
diff --git a/opcua-types/src/lib.rs b/opcua-types/src/lib.rs
index 5beb7ebe..f06fec03 100644
--- a/opcua-types/src/lib.rs
+++ b/opcua-types/src/lib.rs
@@ -250,6 +250,7 @@ pub mod data_value;
 pub mod date_time;
 pub mod diagnostic_info;
 pub mod encoding;
+pub mod errors;
 pub mod event_field;
 pub mod expanded_node_id;
 pub mod extension_object;