diff --git a/mocks/authmocks/plugin.go b/mocks/authmocks/plugin.go
index d103d66..c71c8b9 100644
--- a/mocks/authmocks/plugin.go
+++ b/mocks/authmocks/plugin.go
@@ -1,4 +1,4 @@
-// Code generated by mockery v2.14.1. DO NOT EDIT.
+// Code generated by mockery v2.15.0. DO NOT EDIT.
 
 package authmocks
 
diff --git a/mocks/dbmigratemocks/driver.go b/mocks/dbmigratemocks/driver.go
index 23ac9ae..ad9ca1e 100644
--- a/mocks/dbmigratemocks/driver.go
+++ b/mocks/dbmigratemocks/driver.go
@@ -1,4 +1,4 @@
-// Code generated by mockery v2.14.1. DO NOT EDIT.
+// Code generated by mockery v2.15.0. DO NOT EDIT.
 
 package dbmigratemocks
 
diff --git a/mocks/httpservermocks/go_http_server.go b/mocks/httpservermocks/go_http_server.go
index 749f64a..710e25b 100644
--- a/mocks/httpservermocks/go_http_server.go
+++ b/mocks/httpservermocks/go_http_server.go
@@ -1,4 +1,4 @@
-// Code generated by mockery v2.14.1. DO NOT EDIT.
+// Code generated by mockery v2.15.0. DO NOT EDIT.
 
 package httpservermocks
 
diff --git a/pkg/fftypes/ffi.go b/pkg/fftypes/ffi.go
index 5d9c38e..e59db51 100644
--- a/pkg/fftypes/ffi.go
+++ b/pkg/fftypes/ffi.go
@@ -1,4 +1,4 @@
-// Copyright © 2022 Kaleido, Inc.
+// Copyright © 2023 Kaleido, Inc.
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -46,6 +46,7 @@ type FFI struct {
 	Version     string       `ffstruct:"FFI" json:"version"`
 	Methods     []*FFIMethod `ffstruct:"FFI" json:"methods,omitempty"`
 	Events      []*FFIEvent  `ffstruct:"FFI" json:"events,omitempty"`
+	Errors      []*FFIError  `ffstruct:"FFI" json:"errors,omitempty"`
 }
 
 type FFIMethod struct {
@@ -76,6 +77,21 @@ type FFIEvent struct {
 	FFIEventDefinition
 }
 
+type FFIErrorDefinition struct {
+	Name        string    `ffstruct:"FFIError" json:"name"`
+	Description string    `ffstruct:"FFIError" json:"description"`
+	Params      FFIParams `ffstruct:"FFIError" json:"params"`
+}
+
+type FFIError struct {
+	ID        *UUID  `ffstruct:"FFIError" json:"id,omitempty" ffexcludeinput:"true"`
+	Interface *UUID  `ffstruct:"FFIError" json:"interface,omitempty" ffexcludeinput:"true"`
+	Namespace string `ffstruct:"FFIError" json:"namespace,omitempty" ffexcludeinput:"true"`
+	Pathname  string `ffstruct:"FFIError" json:"pathname,omitempty" ffexcludeinput:"true"`
+	Signature string `ffstruct:"FFIError" json:"signature" ffexcludeinput:"true"`
+	FFIErrorDefinition
+}
+
 type FFIParam struct {
 	Name   string   `ffstruct:"FFIParam" json:"name"`
 	Schema *JSONAny `ffstruct:"FFIParam" json:"schema,omitempty"`
diff --git a/pkg/fftypes/ffi_test.go b/pkg/fftypes/ffi_test.go
index e80937c..33c5d4c 100644
--- a/pkg/fftypes/ffi_test.go
+++ b/pkg/fftypes/ffi_test.go
@@ -62,6 +62,19 @@ func TestValidateFFI(t *testing.T) {
 				},
 			},
 		},
+		Errors: []*FFIError{
+			{
+				FFIErrorDefinition: FFIErrorDefinition{
+					Name: "mathError",
+					Params: []*FFIParam{
+						{
+							Name:   "badOperand",
+							Schema: JSONAnyPtr(`{"type": "integer"}, "details": {"type": "uint256"}`),
+						},
+					},
+				},
+			},
+		},
 	}
 	err := ffi.Validate(context.Background(), true)
 	assert.NoError(t, err)