This error is caused by a data control on a report having an incorrect group assigned to it. Follow these steps to fix the issue:
-Open up All Orders
-From the Reports menu select Design Reports
-Find the report in the list of reports and then highlight the data control on the report that is mentioned in the error.
-Once the field is highlighted, from the Design menu click Property List.
-Once the property list opens, find the Summary Group property, highlight what is in it and backspace it out.
-Save the report and if you are using All Orders Web, preview the report and export it to All Orders Web again.