Error is in VisualForce Component: Error Msg is: Unknown property 'OrderStatus.POWrapperClass.PO_No__c'

APEX CLASS:

global class OrderStatus{

Id accId;

global String name {get;set;}

global List<Sales_Order__c> pendingorder { get;set;}

global List<Sales_Order__c> recentDespatch { get; set;}

global List<Sales_Order__c> pending { get; set; }

global List<Sales_Order__c> despatch { get; set; }

global List pending1 { get; set; }

global List despatch1 { get; set; }

private final Account account;

public OrderStatus(){

try{

account = [select Name,id, (SELECT Contact.Name, Contact.Email FROM Account.Contacts where Contact.Email != null AND Credit_Report__c LIKE 'Yes' ) from Account where id = :ApexPages.currentPage().getParameters().get('id')]; system.debug('try block:'+account);

} catch(Exception e){

System.debug('error sending mail'+e);

}

}

// Code block for "Send Mail" button

public pagereference sendemai(){

String addresses;

String accId = Apexpages.currentPage().getParameters().get('id');

System.debug('Control Enters Send Email Button Code Block');

Messaging.SingleEmailMessage email1 = new Messaging.SingleEmailMessage();

EmailTemplate template = [select id from EmailTemplate where name ='Order_Status_Email'];

system.debug('Control selects the Email Template:'+template);

if(account != null)

accId = account.id ;

Contact c = new Contact( AccountId = accId,LastName = 'Testabc',Email='abhijeet.purohit01@gmail.com',CurrencyIsoCode = 'INR',MobilePhone = '9886098860',Credit_Report__c = 'NO');

insert c; System.debug('contact id = ' + c.id); System.debug('Contact Email ID is selected'); try{ System.debug('Email will be sent now');

email1.setSenderDisplayName('The Production Team');

email1.setTemplateId(template.id);

email1.setTargetObjectId(c.id);

Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email1});

delete c;

System.debug('Control Exits Send Email Button Code Block');

} catch(Exception e){

System.debug('Error while sending Mail :'+e.getMessage());

delete c;

}

System.debug('Send Email Code Block Ends Here.');

return new PageReference('/'+accId);

}

// End of Code Block for "Send Email" button.

// Code block for "Cancel" Button

public pagereference cancelemai(){

system.debug('Control enters Cancel Button Code Block.');

system.debug('Exits Cancel Button');

return new PageReference('/'+accId); }

//Querying data for visualforce page from Invoice object.

public pageReference querySalesOrder(){

System.debug('Control Enters Visual Force Page Code Block');

pendingorder = new List<Sales_Order__c>();

recentDespatch = new List<Sales_Order__c>();

pending = new List<Sales_Order__c>();

despatch = new List<Sales_Order__c>();

accId = Apexpages.currentPage().getParameters().get('id');

system.debug('account ID:'+accID);

// Don't delete these 3 lines

Account acnt = new Account();

acnt = [ select Name from Account where Id =: accId ];

name = acnt.name ;

pendingOrder = [ select PO_No__c, Balance_Quantity__c, Product_Description__c, Sales_Order_Status__c, Current_Despatch_Date_2__c from Sales_Order__c WHERE Account_Name__c =: accId AND (Sales_Order_Status__c != 'Closed') ORDER BY Current_Despatch_Date_2__c ];

System.debug('Queried from pendingorders:'+pendingorder);

for(Sales_Order__c s : pendingOrder){

pending.add(s); system.debug('Pending:'+pending);

}

recentDespatch = [select PO_No__c, Invoice__r.Name, Quote_Quantity__c, Invoiced_Quantity__c, PO_Quantity__c, Product_Description__c, Tentative_Despatch_Date__c, Sales_Order_Status__c FROM Sales_Order__c WHERE Account_Name__c =: accId AND Actual_Despatch_Date_Time__c != Null AND (Sales_Order_Status__c LIKE 'Closed') ORDER BY Tentative_Despatch_Date__c asc limit 10 ]; System.debug('RecentDespatches:'+recentDespatch);

for(Sales_Order__c s1 : recentDespatch){

despatch.add(s1);

System.debug('Despatch:'+despatch); }

return null;

}

// querying data for component

public pageReference querySO(){

System.debug('Control enters VisualForce Component code block');

pendingOrder = new List<Sales_Order__c>();

recentDespatch = new List<Sales_Order__c>();

pending1 = new List();

despatch1 = new List();

accId = ApexPages.currentPage().getParameters().get('id');

System.debug('Account ID'+accId);

Account acc1 = new Account();

acc1 = [SELECT Name FROM Account WHERE id=: accId];

name = acc1.Name;

pendingOrder = [ select PO_No__c, Balance_Quantity__c, Product_Description__c, Sales_Order_Status__c, Current_Despatch_Date_2__c from Sales_Order__c WHERE Account_Name__c =: accId AND (Sales_Order_Status__c != 'Closed') ORDER BY Current_Despatch_Date_2__c ];

System.debug('Queried from Pending Order visual component:'+pendingorder);

for( Sales_Order__c so1 : pendingOrder ){

pending1.add( new POWrapperClass(so1.PO_No__c, so1.Balance_Quantity__c, so1.Product_Description__c, so1.Sales_Order_Status__c, so1.Current_Despatch_Date_2__c));

// pending1.add(so1);

system.debug('Wrapper Pending1:'+pending1);

}

recentDespatch = [select PO_No__c, Invoice__r.Name, Quote_Quantity__c, Invoiced_Quantity__c, PO_Quantity__c, Product_Description__c, Tentative_Despatch_Date__c, Sales_Order_Status__c FROM Sales_Order__c WHERE Account_Name__c =: accId AND Actual_Despatch_Date_Time__c != Null AND (Sales_Order_Status__c LIKE 'Closed') ORDER BY Tentative_Despatch_Date__c asc limit 10 ]; System.debug('Queried from Recent Despatch visual force component:'+recentDespatch);

for( Sales_Order__c so2 : recentDespatch ){

despatch1.add(new RDWrapperClass(so2.PO_No__c, so2.Invoice__r.Name, so2.Invoiced_Quantity__c, so2.Product_Description__c, so2.Tentative_Despatch_Date__c));

// despatch1.add(so2);

system.debug('Wrapper Despatch1:'+despatch1);

}

return null;

}

// Wrapper class for pending orders

public class POWrapperClass{

String poNo;

Decimal balQty;

String pDesc;

String status;

DateTime cDespatch;

public POWrapperClass(String poNo, Decimal balQty, String pDesc, String status, DateTime cDespatch){

this.poNo = poNo;

this.balQty = balQty;

this.pDesc = pDesc;

this.status = status;

this.cDespatch = cDespatch;

}

}

// Wrapper class for recent despatches.

public class RDWrapperClass{

String poNo;

String invName;

Decimal qQty;

Decimal invQty;

Decimal poQty;

String pDesc;

DateTime tDespatch;

String status;

public RDWrapperClass( String poNo, String invName, Decimal invQty, String pDesc, DateTime tDespatch){

this.poNo = poNo;

this.invName = invName;

this.invQty = invQty;

this.pDesc = pDesc;

this.tDespatch = tDespatch; 

} } }