This HTTP response code indicates there is some data that needs to erased, or reset.
This can be information on a form, a document, the pageview, or some other generalized refresh.
If a refresh is completed and the error continues to happen then contacting the server support is recommended.
The HTTP 205 Reset Content response status tells the client to reset the document view, so for example to clear the content of a form, reset a canvas state, or to refresh the UI.
Status
205 Reset Content
Specifications
Specification
Title
RFC 7231, section 6.3.6: 205 Reset Content
Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Compatibility notes
Browser behavior differs if this response erroneously includes a body on persistent connections See 204 No Content for more detail.