My controller:

public class AccountEditController {
   
    accountwrapper1 makeEdit;
    List<accountwrapper1> listAccount = new List<accountwrapper1>();
    List<Account> selectableAccount = new List<Account>();
    List<Account> selectableAccount2 = new List<Account>();
    public Boolean showPopUp { get; set; }
   
   public AccountEditController() {
          showPopUp = False;
   }
    
    public List<accountwrapper1> getAccounts() {
            for(Account a: [SELECT Id, Name, BillingCountry, Phone FROM Account])
            listAccount.add(new accountwrapper1(a));
            return listAccount;            
    }
    
     public PageReference showToPopUp() {
        showPopUp = True;
         selectableAccount.clear();
        for(accountwrapper1 accwrapper : listAccount)
        if(accwrapper.selected == True)
        selectableAccount.add(accwrapper.acc);
        system.debug(selectableAccount);
        return Null;
    }
    
    public string BillingCountry {
        get; 
        set;
    }
    
    
    public PageReference Savemeth() {
        for(account acc :selectableAccount ) {
                acc.BillingCountry = BillingCountry;
                  selectableAccount2.add(acc);
        }    
    update selectableAccount2;
    return Null;
    
    }
    
    public PageReference cancelmeth() {        
        return Null;
    }

    public PageReference GetSelectedAccounts()
    {
       if(selectableAccount.size()>0) {
        system.debug(selectableAccount.size());
        system.debug(selectableAccount);
       return Null;
        }
        else
        return Null;
    } 
    
    
     public class accountwrapper1
    {             
        public Account acc{get; set;}      
        public Boolean selected {get; set;}
        public accountwrapper1(Account a)
        {
            acc = a;
            selected = False;
        }
    }
}

It's produce the error :Compile Error: unexpected token: 'showPopUp' at line 61 column 8

And my Page:

<apex:page controller="AccountEditController" applyHtmlTag="true">
    <apex:form >
        <apex:pageBlock Title="List of Accounts" >
           
               <apex:pageBlockButtons >
                    <apex:commandButton value="Get selected Records" action="{!showToPopUp}" rerender="Output" id="button"/>
               </apex:pageBlockButtons>
               
             <!-- {!showPanel}---->
                  <apex:outputPanel id="Output" >
                       <apex:outputPanel rendered="{!showPopUp}">
                       <!---{!showPanel}---------->
                           <apex:outputLabel value="BillingCountry: "></apex:outputLabel>
                           <apex:inputText id="BillingCountry" value="{!BillingCountry}" size="40" style="height:13px;font-size:11px;"/>                   
                           <apex:commandButton value="save" action="{!Savemeth}"/>
                           <apex:commandButton value="cancel" action="{!cancelmeth}"/>
                      
                        </apex:outputPanel>                   
                    </apex:outputPanel>  
                
               <apex:pageBlockSection Title="List of Available Accounts" columns="1" collapsible="false">
                        <apex:pageblockTable value="{!accounts}" var="a" >
                        
                            <apex:column headerValue="Select" width="60">
                                <apex:inputCheckbox value="{!a.Selected}" id="checkedone" />
                            </apex:column>
                            
                            <apex:column headervalue="Account Name" value="{!a.acc.Name}" width="200"/>
                            <apex:column headervalue="Phone" value="{!a.acc.Phone}" width="300"/>
                            <apex:column headervalue="Billing Country" value="{!a.acc.BillingCountry}" width="300"/>
                                              
                        </apex:pageblocktable>
               </apex:pageBlockSection>
                
        </apex:pageblock>
    </apex:form>
</apex:page>

I don't get any error but there is no pop up window is to be generated for the  entering the billingcountry of the text box and the save / cancel  button. so please help me to solve that case for answers thanks in  advance.