Can you replicate the problem using the default Twenty Fifteen theme with all plugins deactivated?
Run the template Twenty Fifteen theme and turn off all plugins? It will help??
Yes and yes. This is the beginning of the troubleshooting process.
Just to be clear, are you saying Google Webmaster Tools is reporting that it found some 404 errors? Or that your entire site is returning errors?
If it’s the first situation, I wouldn’t switch themes or deactivate plugins. Google doesn’t update its reporting frequently enough to make that sort of activity useful. Instead, you should look at the URLs Google is reporting to be problematic and compare them to URLs that are fine to identify differences.
If it’s the second situation, then esmi is right about starting the troubleshooting process.
My problem is in Google Webmaster Tools that reporting my mobile site as 404 error. but when i go into my mobile site with my phone everyting seems right.
