creating a search page if entered record is found then give as mess record it exist if not then gives a New button to create New record ..

this code is works for search but when m trying to add new button its gives error......

<apex:page StandardController="Work_Order__c" extensions="Search" showheader="true" action="{!redirect}">
<apex:form >
   
            <apex:outputLabel >Enter The Work Order Number ::- </apex:outputLabel>
            
            
            <apex:inputText value="{!searchText}"/><br/>
             
            <apex:commandButton value="Search" Action="{!Search}"/><br/>
             <apex:commandButton value="New" Action="{!createNew}" rendered="{!showNew}"/>
             
             
           
           
           
            <apex:pageBlock >
            <apex:pageBlockSection >
            <apex:outputText >Message: {!msg}</apex:outputText>
             </apex:pageBlockSection> 
           
           
          </apex:pageBlock>
</apex:form>  
</apex:page>
controller............
public class Search
{   
    public String SearchText{get;set;}
    public Work_Order__c wo{get;set;}
    public string msg{get;set;}
    public boolean showNew { get; set;}
 
    public Search(ApexPages.StandardController controller)
     {
        showNew = false;
     }
 
   public void search()
    {
        List<Work_Order__c> wolist=[select id,name from Work_Order__c];
        for(Work_Order__c w:wolist)
        {
            if(w.name.containsIgnorecase(searchText))
            wo=w;                  
        }
        if(wo==null)
       {
            msg='Work Order Number Not Exist u can create New by given link below';
             showNew = true;
                         
        }
        else
        {
            msg='Work Order Number already Exist' ;
           showNew = true;
        }
    }
  
   public PageReference createRecord() {
 
        PageReference createPage=new ApexPages.StandardController(Work_Order__c);
 
        createPage.setRedirect(true);
 
      return createPage;
 
}
 }