g is null

[c14ivan]

i've just tried to install the plugin with this config:
CKEDITOR.plugins.addExternal('lineutils', '{{ js_url() }}ckeditor/plugins/lineutils/plugin.js');
CKEDITOR.plugins.addExternal('slideShow', '{{ js_url() }}ckeditor/plugins/slideShow/plugin.js');
CKEDITOR.replace(id, {
image_previewText:' ',
filebrowserUploadUrl: "url",
imageUploadUrl: connector ,
allowedContent :true,
bootstrap_version : 4,
filebrowserImageBrowseUrl: 'url',
extraPlugins:'slideShow'
});

of curse where it says url goes a real url... and i'm getting this:
[Mostrar/ocultar detalles del mensaje.] TypeError: g is null[Saber más] ckeditor.js:249:441