Error loading searchable documents: error reading searchable documents

Hello,

Hello,

When I want to ‘run index’ it does not index any field to me and it throws me the following errors:
Error loading searchable documents: error reading searchable documents
Site documents: Error loading site documents: parsererror

And when I want to ‘update / create index’, it shows me the following error:

1 validation error detected: Value ‘[site_id, blog_id, id, post_type, post_status, post_format, post_title, post_content, post_excerpt, post_url, post_image, post_date, post_date_gmt, post_modified, post_modified_gmt, post_author, post_author_name, post_extra, category, tag, cf_zona, cf_mapa, cf_imagenes, cf_subtítulo, cf_categoria_de_precios]’ at ‘fieldNames’ failed to satisfy constraint: Member must satisfy constraint: [Member must have length less than or equal to 64, Member must have length greater than or equal to 1, Member must satisfy regular expression pattern: ([a-z][a-z0-9_]*\*?|\*[a-z0-9_]*)]

How can I solve this problem?
I await your answer as soon as possible.

Regards,
Damian