fix: correct reference to nrmse module

index.js

@@ -16,7 +16,7 @@ const configUtils = require('./src/helper/configUtils.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');
@@ -41,4 +41,4 @@ module.exports = {
     MenuManager,
     childRegistrationUtils,
     loadCurve
-};
+};