Unexpected error when loading livereload "X-Content-Type: nosniff"

Hi guys I was debugging an app and then I started to do other things but when I runned the app again in livereload I encountered this issue, after a long search didn’t find nothing, does anyone have a clue about this problem? Thanks in advance.

//Command used:
ionic cordova emulate ios -lcs --target="iPhone-6s, 11.2"

cli packages: (/Users/Fzamperin/.nvm/versions/node/v8.9.4/lib/node_modules)

@ionic/cli-utils  : 1.19.1
ionic (Ionic CLI) : 3.19.1

global packages:

cordova (Cordova CLI) : 7.1.0 
Gulp CLI              : CLI version 3.9.1

local packages:

@ionic/app-scripts : 3.1.8
Cordova Platforms  : android 6.3.0 ios 4.5.4
Ionic Framework    : ionic-angular 3.9.2

System:

Android SDK Tools : 26.1.1
ios-deploy        : 1.9.2 
ios-sim           : 6.1.2 
Node              : v8.9.4
npm               : 5.6.0 
OS                : macOS Sierra
Xcode             : Xcode 9.2 Build version 9C40b 

Environment Variables:

ANDROID_HOME : /Users/Fzamperin/Library/Android/sdk

Misc:

backend : legacy