For one of the views exposed filters I'm using BEF but when I'm trying to save one of the filters as checkboxes/radio buttons it give me below error. I've no clue to what I'm doing wrong.
Any help would be much appreciated.
I found the problem.
Navigate to the BEF settings under the view in question (like the screenshot above).
Scroll down to Require input before results are shown, select the checkbox, there should be a "Text on demand" field.
Set the Text format field to one a valid text format.
Then apply the changes.
I created a video tutorial for you to follow: http://recordit.co/V75Zl4gAAl