Project Server 2013: Timesheet.aspx. The view failed to load.

Recently , I was participating in the Project Server Upgrade from 2010 to 2013. The migration process was typical and well described in Upgrade to Project Server 2013

After migration was over, I have faced several issues in Project Server 2013, which were confirmed as bugs by Microsoft and as of October 2013 were not resolved.

One of them is following:

Issue:

When try to access the timesheet which is having the deleted task, getting the below error.

The view failed to load. Press Ok to reload this view with default settings. Press Cancel to select another view. The issue appears when Single Entry Mode is ON.

Workaround:

To remove offending task, set Single Entry Mode is off, remove the task from the timesheet. If necessary, set the Single Entry Mode back to On.