Hi,

I had developed an app using Canvas. While loading Canvas, it shows an error like,

‘“Oops, there was an error rendering Force.com Canvas application [Hello World].Your browsing session has ended or is invalid. Please re-login to Salesforce.com again.”



The app was working fine before. But now it is frequently showing this error. But once I clear the browser cache and then try again, it works well for a while.  After some time it shows the same error.
The Access Method in the Canvas App Settings is Signed Request (POST)

The visual force page looks like,

<apex:page controller="CanvasController">
	..
	..
	<apex:canvasApp id="canvasFrame" applicationName="HelloWorld" parameters="{!parameters}" width="100%"/>
	..
	..
</apex:page>

And the Controller looks like

public class CanvasController{
	public string parameters{get;set;}
	public Contact contactRecord;
	...
	…
	public void someMethod(){
		..
		contactRecord = [SELECT Id, Name FROM Contact LIMIT 1];
		parameters = JSON.serialize(contactRecord);
	}
}

Please help me if you have any idea. Thanks in advance. 

Hi,

I had developed an app using Canvas. While loading Canvas, it shows an error like,

‘“Oops, there was an error rendering Force.com Canvas application [Hello World].Your browsing session has ended or is invalid. Please re-login to Salesforce.com again.”



The app was working fine before. But now it is frequently showing this error. But once I clear the browser cache and then try again, it works well for a while.  After some time it shows the same error.
The Access Method in the Canvas App Settings is Signed Request (POST)

The visual force page looks like,

<apex:page controller="CanvasController">
	..
	..
	<apex:canvasApp id="canvasFrame" applicationName="HelloWorld" parameters="{!parameters}" width="100%"/>
	..
	..
</apex:page>

And the Controller looks like

public class CanvasController{
	public string parameters{get;set;}
	public Contact contactRecord;
	...
	…
	public void someMethod(){
		..
		contactRecord = [SELECT Id, Name FROM Contact LIMIT 1];
		parameters = JSON.serialize(contactRecord);
	}
}

Please help me if you have any idea. Thanks in advance.