diff --git a/py/stencila/schema/types.py b/py/stencila/schema/types.py
index 233f86be..d1605785 100644
--- a/py/stencila/schema/types.py
+++ b/py/stencila/schema/types.py
@@ -292,11 +292,15 @@ def __init__(
 class CodeError(Entity):
     """An error that occured when parsing, compiling or executing some Code."""
 
+    kind: str
+    message: Optional[str] = None
     trace: Optional[str] = None
 
     def __init__(
         self,
+        kind: str,
         id: Optional[str] = None,
+        message: Optional[str] = None,
         meta: Optional[Dict[str, Any]] = None,
         trace: Optional[str] = None
     ) -> None:
@@ -304,6 +308,10 @@ def __init__(
             id=id,
             meta=meta
         )
+        if kind is not None:
+            self.kind = kind
+        if message is not None:
+            self.message = message
         if trace is not None:
             self.trace = trace
 
diff --git a/r/R/types.R b/r/R/types.R
index 3cd57784..d9631ecf 100644
--- a/r/R/types.R
+++ b/r/R/types.R
@@ -321,13 +321,17 @@ CodeExpression <- function(
 #' An error that occured when parsing, compiling or executing some Code.
 #'
 #' @name CodeError
+#' @param kind The type of error. \bold{Required}.
 #' @param id The identifier for this item.
+#' @param message The error message or brief description of the error.
 #' @param meta Metadata associated with this item.
 #' @param trace Stack trace leading up to the error.
 #' @seealso \code{\link{Entity}}
 #' @export
 CodeError <- function(
+  kind,
   id,
+  message,
   meta,
   trace
 ){
@@ -336,6 +340,8 @@ CodeError <- function(
     meta = meta
   )
   self$type <- as_scalar("CodeError")
+  self[["kind"]] <- check_property("CodeError", "kind", TRUE, missing(kind), "character", kind)
+  self[["message"]] <- check_property("CodeError", "message", FALSE, missing(message), "character", message)
   self[["trace"]] <- check_property("CodeError", "trace", FALSE, missing(trace), "character", trace)
   class(self) <- c("list", "Entity")
   self
diff --git a/schema/CodeError.schema.yaml b/schema/CodeError.schema.yaml
index 1df593b7..082eafcf 100644
--- a/schema/CodeError.schema.yaml
+++ b/schema/CodeError.schema.yaml
@@ -6,13 +6,18 @@ status: unstable
 category: code
 description: An error that occured when parsing, compiling or executing some Code.
 properties:
-  type:
-    '@id': stencila:errorType
+  kind:
+    # not called `type` because this is a conflict or not supported by Python
+    '@id': stencila:errorKind
     description: The type of error.
     type: string
+  message:
+    '@id': stencila:errorMessage
+    description: The error message or brief description of the error.
+    type: string
   trace:
     '@id': stencila:trace
     description: Stack trace leading up to the error.
     type: string
 required:
-  - type
+  - kind
diff --git a/ts/bindings/typescript.ts b/ts/bindings/typescript.ts
index 5b856331..27f105c4 100644
--- a/ts/bindings/typescript.ts
+++ b/ts/bindings/typescript.ts
@@ -151,7 +151,10 @@ export const unionGenerator = (schema: Schema): string => {
  */
 const funcName = (name: string): string => {
   const func = `${name.substring(0, 1).toLowerCase() + name.substring(1)}`
-  const reserved: { [key: string]: string } = { delete: 'del' }
+  const reserved: { [key: string]: string } = {
+    delete: 'del',
+    function: 'function_'
+  }
   if (reserved[func] !== undefined) return reserved[func]
   else return func
 }