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.
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| Sitecore WFFM collection is readonly - initial screen |
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| 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.
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| Sitecore WFFM form template with form section child item |
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