There are a few potential reasons for this error:

1. You may have forgotten to include the getStaticProps function in your page component. This function is required for the server-side rendering of the page.
2. You may have incorrectly implemented the getStaticProps function. Make sure that it is correctly returning an object with a props key, and that the value of the props key is the object containing your page’s props.
3. You may have a problem with the data you are trying to pass to the getStaticProps function. Make sure that the data you are passing is valid and can be serialized.
4. There may be a problem with the server-side rendering process itself. Make sure that you have correctly set up the server-side rendering configuration in your Next.js app.

To troubleshoot the issue further, you may want to check the logs for any error messages that could help identify the problem. You can also try adding some logging statements to your getStaticProps function to help debug the issue.