[TYPO3-workspace] workspaces preview link throws 404 Error

[atul shinh]

HI all,

I am using TYPO3 4.7.1 and using the system extension "workspaces" to make use of workspace functionality. 
Bit more about setup 

1. Domain created 
2. Workspace created and required settings done e.g. mount point, owner etc. 

Problem: 
When I create or edit the content in workspace and try to preview it (as shown in attached image screen_1), I am unable to see preview rather a Error 404 page. 
I could not find a reason but found that on the preview page there are some JS errors. 

Uncaught Error: SecurityError: DOM Exception 18                                                            mod.php:177
Failed to load resource: the server responded with a status of 404 (Not Found)      http://dev-server/sitename/typo3/%7BwsUrl%7D 
Failed to load resource: the server responded with a status of 404 (Not Found)       http://dev-server/sitename/typo3/%7BliveUrl%7D 

Moreover if I go in detail of mod.php error, I find that some of the variables in JS are not getting values 

e.g. 

        var liveUrl = '{liveUrl}';
	var wsUrl = '{wsUrl}';
	var wsSettingsUrl = '{wsSettingsUrl}';
	document.domain = '{backendDomain}';


I have tried some patches but none worked. 

Please reply with any reason why this issue is occuring. Moreover on my local machine the workspaces are working fine.  Can it be some environment related issue? 

Thanks for any reply..