I have been experiencing the same issue but after analysing the problem, I saw that the metabox.js file (which is in the ../inc/scripts folder) has the “all” type parameter within the library object.
I changed the following from lines 112 – 121:
this.mediaFrame = wp.media({
title: ‘Add Media Attachments’, button: {
text: ‘Attach to Post’
}, multiple: true,
library: {
type: ‘all’ –> error
} });
Replaced with:
this.mediaFrame = wp.media({
title: ‘Add Media Attachments’,
button: {
text: ‘Attach to Post’
},
multiple: true
});
This solution completely solved my problem.
