diff --git a/package.json b/package.json
index 0f69ddc..56ecc3c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "json-validations-lib",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "scripts": {
     "test-units": "cross-env BUILD_ENV=test DEBUG=amio* mocha test/test_unit/**/*.test.js --reporter mocha-multi-reporters --reporter-options configFile=test/mocha-reporters-config.json",
     "can-publish-nix": "npm info $npm_package_name version | npm-version-bump-checker",
diff --git a/src/utils/validation-errors-converter.js b/src/utils/validation-errors-converter.js
index 1c13147..2aa371d 100644
--- a/src/utils/validation-errors-converter.js
+++ b/src/utils/validation-errors-converter.js
@@ -22,6 +22,14 @@ function convertValidationError(error) {
       return new SchemaValidatorError(`Property '${propName}' must have value '${params.allowedValue}'.`, errorObject.dataPath, errorObject.data)
     case 'enum':
       return convertEnum(errorObject.data, errorObject.dataPath, params, propName, errorObject.schemaPath)
+    case 'keys_not_equal': {// non-schema error
+      const message = `Provided keys do not match expected keys: ${params.originalKeys}.`
+      return new SchemaValidatorError(message, errorObject.dataPath, errorObject.data)
+    }
+    case 'not_found':// non-schema error
+      const notFoundPropName = params.notFoundPropName
+      const message = `Cannot find ${notFoundPropName} with id ${errorObject.data}.`
+      return new SchemaValidatorError(message, errorObject.dataPath, errorObject.data)
     case 'format':
       if(errorObject.params.format === 'httpUrl') {
         const message = `Property '${propName}' must be a valid URL. Current value is "${errorObject.data}"`
diff --git a/test/test_unit/validation-errors-converter.test.js b/test/test_unit/validation-errors-converter.test.js
index 36613c9..720ffc7 100644
--- a/test/test_unit/validation-errors-converter.test.js
+++ b/test/test_unit/validation-errors-converter.test.js
@@ -1,5 +1,6 @@
 const expect = require('chai').expect
 const SchemaValidator = require('../../src/schema-validator')
+const ValidationErrorsConverter = require('../../src/utils/validation-errors-converter')
 const clone = require('ramda/src/clone')
 
 describe('validation-error-converter test', () => {
@@ -159,4 +160,21 @@ describe('validation-error-converter test', () => {
             rejected_value: 'invalid-email'
         })
     })
+
+    it('not_found', () => {
+        const schemaError = {
+            keyword: 'not_found',
+            dataPath: 'message_template.id',
+            data: 1,
+            params: {
+                notFoundPropName: 'message_template'
+            }
+        }
+        const result = ValidationErrorsConverter.convertValidationError(schemaError)
+        expect(result).to.include({
+            message: 'Cannot find message_template with id 1.',
+            field: 'message_template.id',
+            rejected_value: 1
+        })
+    })
 })