When RenderChoiceAs is set to SingleCheckBox, there should be only one ChoiceItem in the collection
How to replicate this error from fresh installation
Is there any solution for this? Thank you.
Do you find out the way to fix this issue? I met problem with the same Sitefinity version
Go to News Settings -> News -> Controls -> NewsBackend -> View -> NewsBackendEdit -> Sections -> MoreOptionsSection -> Fields
Choose 1 of 3 fields:
When I clicked Save changes button, a lot of choice items were added to ChoicesConfig (See attachment). Then I changed the RenderChoiceAs of 3 above fields to DropDown and the error gone. It happens to blog post, news, event...