"The page you requested was not found." when adding channel fields

Hello,

I have a fresh install of ExpressionEngine Core v2.9.2

I get the following error when trying to add a channel field:

“Error

The page you requested was not found.”

The link that is in the browser bar at the time of the error is: http://example.com/system/index.php?/cp/admin_content/field_edit&S=9592632fa43fdc27adada0e0f9edf882

• I have the .htaccess file to remove index.php and have removed it from the settings
• Hosting on a value plan with Namecheap

Any help would be greatly appreciated! 😊