Code 32 Could not Authenticate you


I was trying to integrate my app with twitter using rest service. I want to do posts in twitter. I tried using (postman) to see if it was working… I followed this link to autheticate “” ,and another video on youtube. Everything seems fine but always shows up that error message “Could not authenticate you”. I have this error for 2 days, if someone could help i would appreciate. Thank you. Im still a noob, sorry if there is wrong information or lack of it