I was using 1.1.2. When I upgrade to 1.2, there is a breaking change. block-column
(1.1.2) –> block-columns
(1.2)
**v1.2 still has this issue.**
I have checked the js code and I guess the following line is not good.
return wp.element.createElement("div",{class:"row "+e.attributes....
class
may not be a proper attribute. I think the following should work:
return wp.element.createElement("div",{className:"row "+e.attributes....