I have deployed my site but have a page not found error with www. web adress

[coelmay]

Quite possibly you have a local cache issue. Alternatively, you may have Cloudflare proxy enabled which is advised against as per the following support guide

[Support Guide] What problems could occur when using Cloudflare in front of Netlify?

Last reviewed by Netlify Support - August, 2023 Note: We recommend not using both Cloudflare’s CDN (“Accelerate and Protect”, the orange cloud in their UI) and Netlify for the same site at the same time. Why? Read on! Netlify’s web service is not designed to work optimally with another CDN “in front of” our CDN. Proxying to our service is in general not supported and we advise you not to do it for best hosting results. Cloudflare has made similar statements that it doesn’t recommend this usa…