We just added the plugin and then everytime the page loads.. the warning shows.
"Warning: strpos(): Empty needle in C:\Columbus Websites\hsfw\wp-contentplugins\wordpress-seo-premium\inc\sitemaps\class-sitemaps-renderer.php on line 343"
I want to remove the error.
If applicable, add screenshots to help explain your problem.

Thanks for reporting this issue. First, you can remove the warning by disabling debugging on your site in the wp-config.php file.
Secondly, when you have purchased our premium product, you are entitled to support via e-mail. They can help you troubleshoot your issue, as you are currently asking for support. we use GitHub for well documented bugs. Therefore, I’m closing this. Please follow these guidelines to improve your bug report.
You can contact the premium support team by:
Thanks for your understanding.