diff --git a/crates/caldav/src/calendar/methods/report/sync_collection.rs b/crates/caldav/src/calendar/methods/report/sync_collection.rs
index b44c77a..1afed83 100644
--- a/crates/caldav/src/calendar/methods/report/sync_collection.rs
+++ b/crates/caldav/src/calendar/methods/report/sync_collection.rs
@@ -27,8 +27,11 @@ impl Value for SyncLevel {
         Ok(match val {
             "1" => Self::One,
             "Infinity" => Self::Infinity,
-            // TODO: proper error
-            _ => return Err(rustical_xml::XmlDeError::UnknownError),
+            _ => {
+                return Err(rustical_xml::XmlDeError::Other(
+                    "Invalid sync-level".to_owned(),
+                ))
+            }
         })
     }
     fn serialize(&self) -> String {
diff --git a/crates/carddav/src/addressbook/methods/report/sync_collection.rs b/crates/carddav/src/addressbook/methods/report/sync_collection.rs
index ceba911..955f41f 100644
--- a/crates/carddav/src/addressbook/methods/report/sync_collection.rs
+++ b/crates/carddav/src/addressbook/methods/report/sync_collection.rs
@@ -26,8 +26,11 @@ impl Value for SyncLevel {
         Ok(match val {
             "1" => Self::One,
             "Infinity" => Self::Infinity,
-            // TODO: proper error
-            _ => return Err(rustical_xml::XmlDeError::UnknownError),
+            _ => {
+                return Err(rustical_xml::XmlDeError::Other(
+                    "Invalid sync-level".to_owned(),
+                ))
+            }
         })
     }
     fn serialize(&self) -> String {
diff --git a/crates/store/src/calendar/timestamp.rs b/crates/store/src/calendar/timestamp.rs
index 481c092..ac8588c 100644
--- a/crates/store/src/calendar/timestamp.rs
+++ b/crates/store/src/calendar/timestamp.rs
@@ -26,8 +26,9 @@ impl Value for UtcDateTime {
         let input = <String as Value>::deserialize(val)?;
         Ok(Self(
             NaiveDateTime::parse_from_str(&input, UTC_DATE_TIME)
-                // TODO: proper error
-                .map_err(|_| rustical_xml::XmlDeError::UnknownError)?
+                .map_err(|_| {
+                    rustical_xml::XmlDeError::Other("Could not parse as UTC timestamp".to_owned())
+                })?
                 .and_utc(),
         ))
     }
diff --git a/crates/xml/derive/src/xml_enum.rs b/crates/xml/derive/src/xml_enum.rs
index af0a5f2..c6b3f2c 100644
--- a/crates/xml/derive/src/xml_enum.rs
+++ b/crates/xml/derive/src/xml_enum.rs
@@ -31,7 +31,7 @@ impl Enum {
                 ) -> Result<Self, rustical_xml::XmlDeError> {
                     #(#variant_branches);*
 
-                    Err(rustical_xml::XmlDeError::UnknownError)
+                    Err(rustical_xml::XmlDeError::InvalidVariant("could not match".to_owned()))
                 }
             }
         }
@@ -162,12 +162,30 @@ impl Enum {
                         let empty = matches!(event, Event::Empty(_));
 
                         match event {
-                            Event::Decl(_) => { /* <?xml ... ?> ignore this */ }
-                            Event::Comment(_) => { /*  ignore this */ }
                             Event::Start(start) | Event::Empty(start) => {
                                 return <Self as ::rustical_xml::XmlDeserialize>::deserialize(&mut reader, &start, empty);
                             }
-                            _ => return Err(::rustical_xml::XmlDeError::UnknownError),
+
+                            Event::Eof => return Err(::rustical_xml::XmlDeError::Eof),
+                            Event::Text(bytes_text) => {
+                                return Err(::rustical_xml::XmlDeError::UnsupportedEvent("Text"));
+                            }
+                            Event::CData(cdata) => {
+                                return Err(::rustical_xml::XmlDeError::UnsupportedEvent("CDATA"));
+                            }
+                            Event::Comment(_) => { /* ignore */ }
+                            Event::Decl(_) => {
+                                return Err(::rustical_xml::XmlDeError::UnsupportedEvent("Declaration"));
+                            }
+                            Event::PI(_) => {
+                                return Err(::rustical_xml::XmlDeError::UnsupportedEvent("Processing instruction"));
+                            }
+                            Event::DocType(doctype) => {
+                                return Err(::rustical_xml::XmlDeError::UnsupportedEvent("Doctype in the middle of the document"));
+                            }
+                            Event::End(end) => {
+                                return Err(::rustical_xml::XmlDeError::UnsupportedEvent("Premature end"));
+                            }
                         };
                     }
                 }
diff --git a/crates/xml/src/de.rs b/crates/xml/src/de.rs
index 0c761cb..ec0b779 100644
--- a/crates/xml/src/de.rs
+++ b/crates/xml/src/de.rs
@@ -1,11 +1,9 @@
-use quick_xml::name::Namespace;
+use quick_xml::events::{BytesStart, Event};
 use quick_xml::name::ResolveResult;
 use std::io::BufRead;
 pub use xml_derive::XmlDeserialize;
 pub use xml_derive::XmlDocument;
 
-use quick_xml::events::{BytesStart, Event};
-
 use crate::XmlDeError;
 use crate::XmlRootTag;
 
@@ -69,7 +67,7 @@ impl<T: XmlRootTag + XmlDeserialize> XmlDocument for T {
 
                     return Self::deserialize(&mut reader, &start, empty);
                 }
-                _ => return Err(XmlDeError::UnknownError),
+                _ => return Err(XmlDeError::UnsupportedEvent("unknown, todo")),
             };
         }
     }
diff --git a/crates/xml/src/error.rs b/crates/xml/src/error.rs
index 5ea9b76..a4d1ab0 100644
--- a/crates/xml/src/error.rs
+++ b/crates/xml/src/error.rs
@@ -6,8 +6,6 @@ pub enum XmlDeError {
     QuickXmlError(#[from] quick_xml::Error),
     #[error(transparent)]
     QuickXmlAttrError(#[from] quick_xml::events::attributes::AttrError),
-    #[error("Unknown error")]
-    UnknownError,
     #[error("Invalid tag [{0}]{1}. Expected [{2}]{3}")]
     InvalidTag(String, String, String, String),
     #[error("Missing field {0}")]
diff --git a/crates/xml/src/value.rs b/crates/xml/src/value.rs
index 6912de9..51de4b4 100644
--- a/crates/xml/src/value.rs
+++ b/crates/xml/src/value.rs
@@ -57,7 +57,7 @@ impl Value for &str {
         self.to_string()
     }
 
-    fn deserialize(val: &str) -> Result<Self, XmlDeError> {
+    fn deserialize(_val: &str) -> Result<Self, XmlDeError> {
         Err(XmlDeError::Other("TODO: Handle this error".to_owned()))
     }
 }