diff --git a/index.js b/index.js
index d542a17..d2c2ec6 100644
--- a/index.js
+++ b/index.js
@@ -12,11 +12,12 @@ const outputUtils = require('./src/helper/outputUtils.js');
 const logger = require('./src/helper/logger.js');
 const validation = require('./src/helper/validationUtils.js');
 const configUtils = require('./src/helper/configUtils.js');
+const assertions = require('./src/helper/assertionUtils.js')
 
 // Domain-specific modules
 const { MeasurementContainer } = require('./src/measurements/index.js');
 const configManager = require('./src/configs/index.js');
-const nrmse = require('./src/nrmse/ErrorMetrics.js');
+const nrmse = require('./src/nrmse/errorMetrics.js');
 const state = require('./src/state/state.js');
 const convert = require('./src/convert/index.js');
 const MenuManager = require('./src/menu/index.js');
@@ -34,6 +35,7 @@ module.exports = {
     configUtils,
     logger,
     validation,
+    assertions,
     MeasurementContainer,
     nrmse,
     state,