@layheng, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project
See About the Installation & Troubleshooting category.
- Which DHT library did you install?
- Where did you install it?
- Did you try the examples that come with the library? Do they work?
- What are the errors that you get?
- Show your code; don't forget to use code tags (the </> button above the reply text box).