ChannelChoiceType doesn't support multiple = false
Configuration (note: is used in a Braincrafted\Bundle\BootstrapBundle\Form\Type\BootstrapCollectionType):
Error message (at /admin/block/new?class=AppBundle\Document\Block\FreeProfileBlock):
Make it possible to use the ChannelChoiceType for a single channel selection in a BootstrapCollectionType, or provide another solution. In the problem is investigated and isolated to the transformer, who doesn't support a single value.
could you take a look at the composer update PR?
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