Approval Workflow in Office 365

Hi there :

I have got a requirement to send the link to the current approval task to the approvers. Approval workflow by default doesn't do that. However when I try to edit the out of the box Approval - SharePoint 2010 workflow OR I try to copy and modify the same, I get the following error :

Though I get this error, I can make changes to both out of the box Approval - SharePoint 2010 workflow and copied one. After I publish, the changes are reflected in the copied one but not in the out of the box one.

So though I can achieve what I want, this error message in the beginning should not be there.

Cheers!

developer_melbourne