You are creating a new survey in the Survey Builder and encounter the following error - Invalid field:TASK.DUE_DATE in related list:RelatedActivityList

This error indicates that the user creating the survey doesn't have sufficient access to the Due Date field on the Task object (shown on the Open Activities and Activity History related lists).

To extend sufficient access to this field:

1. Navigate to Setup | Build | Customize | Activities | Task Fields.
2. Select the Due Date field.
3. Click the Set Field-Level Security button.
4. Select the Visible checkbox next to the affected profile(s) and click Save.

Once sufficient access to this field has been extended, the user should no longer experience this error in the Survey Builder.