Error: The value of attribute "controller" associated with an element type "apex:page" must not contain the '<' character.

11:59 AM

This message appears when you have not specified the syntax properly. The line of code which caused this error is below, note that the value for the attribute "controller" has not been closed properly with the corresponding closing quotes

<apex:page showheader="false" controller="PrimaryContactManager>

The correct code would be

<apex:page showheader="false" controller="PrimaryContactManager">