@nayan05 make sure you dont use the main branch if you have problems. Use the stable branch as mentioned in the docs:
https://stackblitz-labs.github.io/bolt.diy/#clone-the-repository
Other then that, you can try to use a starter template as shown in a quick YouTube Short here:
Also important is the Model/LLM you are using to create your project. Make sure you dont use small LLMs <8B Tokens. At best use big ones like Sonnet, Gemini 2.0, etc., also mentioned here in the FAQ:
https://stackblitz-labs.github.io/bolt.diy/FAQ/
If you are on Windows, check my install Video:
Also take a look at the Videos from @dustinwloring1988: