Cant save when add media abd add link with ckeditor

hi i have 2 problem ,

  1. when adding media it not allow to save
  2. when the collection have relation with other collection and i add the link it not allow to save also

two error hit 403,
may i know this is the common error any solution , may i know how to return the response error instead of 403

the article i refer to change the ckeditor is Field Registering - Strapi Developer Documentation