Error: Value not in the right type/format. Please double check the value or select type "other".

[R1ch01d]

When creating custom Template through "Event Actions > Add Template", user is not enforced to define Category and Type of an Attribute block, which in turn throws errors in an attempt to populate event.

This succeeds:

But when using the template, obviously it turns red:

Hence suggestion is to enforce user to define Attribute Category and Type when creating Template.