Error: Entity is not org accessible.

Can any one explain what it means??????

Pleas help asap

Thanks in advance

System.debug([SELECT What.Subject FROM Task ORDER BY CreatedDate DESC]);

SELECT What.Subject FROM Task ORDER BY CreatedDate DESC 

Why this is query is not working????

Task is having lookup with case and the relation ship name is "What"

Please give the reason

Thanks in advance

Hi

help me!!

Page

<apex:page controller="PagingController">
<apex:form id="fid">

<apex:pageBlock title="Paging through Categories of Stuff">

<apex:pageBlockButtons location="top">
<apex:commandButton action="{!process}" value="Process Selected" onclick="confirm('Delete');} " />
<apex:commandButton action="{!cancel}" value="Cancel"/>
</apex:pageBlockButtons>
<apex:pageMessages />

<apex:pageBlockSection title="Category Results - Page #{!pageNumber}" columns="1">
<apex:pageBlockTable value="{!categories}" var="c" >
<apex:column width="25px">
<apex:inputCheckbox value="{!c.checked}"/>
</apex:column>
<apex:column value="{!c.cat.Name}" headerValue="Name"/>
</apex:pageBlockTable>
</apex:pageBlockSection>
</apex:pageBlock>

<apex:panelGrid columns="4">
<apex:commandLink action="{!first}">First</apex:commandlink>
<apex:commandLink action="{!previous}" rendered="{!hasPrevious}">Previous</apex:commandlink>
<apex:commandLink action="{!next}" rendered="{!hasNext}" reRender="fid">Next</apex:commandlink>
<apex:commandLink action="{!last}">Last</apex:commandlink>
</apex:panelGrid>

</apex:form>
</apex:page>

controller

public class PagingController {

List<categoryWrapper> categories {get;set;}

// instantiate the StandardSetController from a query locator
public ApexPages.StandardSetController con {get; set;}
public ApexPages.StandardSetController getcon ()
{
if(con == null) {
con = new ApexPages.StandardSetController(Database.getQueryLocator([Select Id, Name FROM Position__c Order By Name limit 100]));
// sets the number of records in each page set
con.setPageSize(5);
}
return con;

}
// returns a list of wrapper objects for the sObjects in the current page set

public List<categoryWrapper> getCategories() {
getcon();
categories = new List<categoryWrapper>();
for (Position__c category : (List<Position__c>)con.getRecords())
categories.add(new CategoryWrapper(category));
System.debug(categories.size());
return categories;
}

// displays the selected items
public PageReference process() {
List<Position__c> positionList=new List<Position__c>();
for (CategoryWrapper cw : categories) {
if (cw.checked)
{
cw.cat.StatusTest__c=true;
positionList.add(cw.cat);
}

//ApexPages.addMessage(new ApexPages.message(ApexPages.severity.INFO,cw.cat.name));
}
update positionList;
return null;
}

// indicates whether there are more records after the current page set.
public Boolean hasNext {
get {
return con.getHasNext();
}
set;
}

// indicates whether there are more records before the current page set.
public Boolean hasPrevious {
get {
return con.getHasPrevious();
}
set;
}

// returns the page number of the current page set
public Integer pageNumber {
get {
return con.getPageNumber();
}
set;
}

// returns the first page of records
public void first() {
con.first();
}

// returns the last page of records
public void last() {
con.last();
}

// returns the previous page of records
public void previous() {
con.previous();
}

// returns the next page of records
public void next() {
con.next();
}

// returns the PageReference of the original page, if known, or the home page.
public void cancel() {
con.cancel();
}

}

After updating on clik of next i'm getting Visualforce Exception???

Can anyone please explain why it is so???

System.debug([SELECT What.Subject FROM Task ORDER BY CreatedDate DESC]);

SELECT What.Subject FROM Task ORDER BY CreatedDate DESC 

Why this is query is not working????

Task is having lookup with case and the relation ship name is "What"

Please give the reason

Thanks in advance