There are two possibilities I can think of.
1. Your absolute path to the chrome driver may not be valid now. Kindly cross check if you absolute path to the chrome driver you have mentioned is valid.
2. If your your chrome browser is upgraded, you may have to download new chromedriver.exe and update it. Chrome is always set to be updated, you can not stop it. In that case, you will have to update your chromedriver.exe file.
If you are facing specific error or issue, let us know.