Call to a member function getError() on a non-object in public_html/engine/lib/filestore.php on line 79

Hi all,

Can anyone help with this error please.  It results in a white page with the following:

Fatal error: Call to a member function getError() on a non-object in /public_html/engine/lib/filestore.php on line 79

On Page = /action/groups/edit

ie. when saving an amended group description etc, instead of saving the revised data and returning to the saved group.  When I press "back", the data has been saved properly, but I am still in the Edit screen.

Filestore Line 79 appears to be concerned with the profile icon, but this has not been changed.

I am using Coldtric's Profile Manager, Group Tools and Widget manager as well as AU_Subgroups on elgg 1.11.0