Hi 
I am creating case through vf page where i have to attach attchment to that case while creating that case record but when i hit the save button. I am geeting error as 
"Insert failed. First exception on row 0; first error: REQUIRED_FIELD_MISSING, Required fields are missing: [Body]: [Body]
Error is in expression '{!Save}' in component <apex:commandButton> in page newcase_page_for_community: Class.AutoPopulateExample.save: line 64, column 1"
Please let me know if i am doing something wrong.

VF page

<apex:page standardController="Case" extensions="AutoPopulateExample">
   
    <apex:form id="form">
    	<apex:pageBlock >
          
            <apex:pageBlockButtons location="top">
              <apex:commandButton value="Save" action="{!Save}"/>
              <apex:commandButton value="Cancel" action="{!Cancel}"/>
            </apex:pageBlockButtons> 
            
           <apex:pageBlockSection title="Basic Details" columns="2">
               <apex:inputField label="Contact Name" value="{!Case.ContactId}" >
               	<apex:actionSupport event="onchange" action="{!autoCal}" reRender="form"/>
               </apex:inputField>
               <apex:inputField label="Requestor First Name" value="{!Case.Requestor_First_Name__c}"/>
               <apex:inputField label="Account Name" value="{!Case.AccountId}"/>
               <apex:inputField label="Requestor Last Name" value="{!Case.Requestor_Last_Name__c}"/>
               <apex:inputField label="Status" value="{!Case.Status}"/>
               <apex:inputField label="Requestor Email" value="{!Case.Requester_Email__c}"/>
               <apex:inputField label="Subject" value="{!Case.Subject}"/>
               <apex:inputField label="Requestor Contact Number" value="{!Case.Requester_Contact_Number__c}"/>
               <apex:inputField label="Product" value="{!Case.Products__c}"/>
               <apex:inputField label="Business Impact" value="{!Case.Business_Impact__c}"/>
               <apex:inputField label="Components" value="{!Case.Componet__c}"/>
               <apex:inputField label="Business Urgency" value="{!Case.Business_Urgency__c}"/>
               <apex:inputField label="On Behalf of" value="{!Case.On_Behalf_of__c}"/>
               <apex:inputField label="Environment" value="{!Case.Environment__c}"/>
               <apex:inputField label="Description" value="{!Case.Description__c}"/>
           </apex:pageBlockSection>
            </apex:pageBlock>
        </apex:form>
		
        <apex:form >
            <apex:outputPanel id="theSection" rendered="true">
            <apex:pageblock >
                <apex:pageBlockSection title="Uploading the Attachment" collapsible="false" dir="LTR" columns="1">
        <div id="upload" class="upload">                                   
            <apex:inputFile id="fileToUpload" value="{!fileBody}" filename="{!fileName}" styleClass="input-file"/>                            
        </div> 
         </apex:pageBlockSection>      
   		 </apex:pageBlock>
            </apex:outputPanel>       
     </apex:form>
	 
</apex:page>

Apex Controller :

public class AutoPopulateExample
{
public string fileName{get;set;} 
public Blob fileBody{get;set;}
public Contact con{get;set;}
public Case caseObject{get;set;}
public Attachment attachmentObject  {
  get {
      if (attachmentObject  == null)
        attachmentObject  = new Attachment();
      return attachmentObject ;
    }
  set;
  }
public ApexPages.StandardController stdCntrlr {get; set;}
    
public AutoPopulateExample(ApexPages.StandardController controller)
{
    con = new Contact();
    caseObject = new case();
    caseObject = (Case)controller.getRecord();
    attachmentObject = new Attachment();
}

//function is called from actionsupport event

public void autoCal()
{

Id conid = caseObject.ContactId;     // collecting contact id from visualforce page
List<Contact> conLst = [select id,AccountId,FirstName,LastName,Email,Phone from contact where id=:conid];
if(conLst.isEmpty())
{
 return;
}    
caseObject.Requestor_First_Name__c = conLst[0].FirstName;      
caseObject.AccountId = conLst[0].AccountId; 
caseObject.Requestor_Last_Name__c = conLst[0].LastName;
caseObject.Requester_Email__c = conLst[0].Email; 
caseObject.Requester_Contact_Number__c = conLst[0].Phone; 
}

public PageReference save()
{
        // Save the Case
        insert caseObject;

        // Save the Attachment using the Case id as the parent Id
        System.debug('@@@@@fileBody'+fileBody);     
        attachmentObject = new Attachment();
              Integer i=0;
              attachmentObject .clear();
              attachmentObject.Body = fileBody; 
              attachmentObject.Name = 'Logo_'+caseObject.id+'.jpeg' ; 
              attachmentObject.ParentId = caseObject.id;             
              insert attachmentObject;                 
        pagereference pr = new pagereference('/'+caseObject.id);                           
        return pr;
}
}

Please suggest.