Monday, January 22, 2018

Sitecore WFFM Collection is read-only error

In a version 8.2 instance of Sitecore with version 8.2 of WFFM (rev. 161129), the following error occurred when trying to add a new field to the form.
Collection is read-only.
Sitecore WFFM collection is readonly - initial screen

Sitecore WFFM collection is readonly - expanded state
In this case, the form had been added as the Form template (/sitecore/templates/Web Forms for Marketers/Form) which is correct, but there was no child template of type Form Section (/sitecore/templates/Web Forms for Marketers/Form Section). By inserting a new form section child item, I was then able to add fields as desired.

Sitecore WFFM form template with form section child item

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