I encountered an error when submitting a form.

The form is submitted with a required field and the field left blank.

display :string, :required

What does the errors mean? and how to fix it?

undefined method `publishable_transitions_for' for nil:NilClass

1: <show-page>
2:   <append-content-header:>
3:     <transition-buttons/>4:   </append-content-header:>5:   <collection: 
replace>
6:   <table-plus:a_objects fields="this, display">
7:     <empty-message:>No objects match your criteria</empty-message:>

Error stack

app/views/a_apps/show.dryml:4:in `block (4 levels) in render_page'
app/views/a_apps/show.dryml:2:in `block (3 levels) in render_page'
app/views/taglibs/auto/rapid/pages.dryml:546:in `block (8 levels) in 
show_page__for_a_object'
app/views/taglibs/auto/rapid/pages.dryml:545:in `block (7 levels) in 
show_page__for_a_object'
app/views/taglibs/auto/rapid/pages.dryml:545:in `block (6 levels) in 
show_page__for_a_object'
app/views/taglibs/auto/rapid/pages.dryml:544:in `block (5 levels) in 
show_page__for_a_object'
app/views/taglibs/auto/rapid/pages.dryml:544:in `block (4 levels) in 
show_page__for_a_object'
app/views/taglibs/auto/rapid/pages.dryml:543:in `block (3 levels) in 
show_page__for_a_object'
app/views/taglibs/auto/rapid/pages.dryml:539:in `block in 
show_page__for_a_object'
app/views/taglibs/auto/rapid/pages.dryml:538:in `show_page__for_a_object'
app/views/a_apps/show.dryml:1:in `block in render_page'
app/views/a_apps/show.dryml:1:in `render_page'
app/views/a_apps/show.dryml:1:in 
`_app_views_a_apps_show_dryml___4460466109160282585_70153904473400'


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