Personal library not recognized (error log message)

After a recent update, the metadata for downloaded content (YouTube) from my personal library (like thumbnails, titles, and subtitles) is no longer recognized.

Log:

“X-Plex-Container-Size header exceeds limit 120. This will fail with status code 400 in the future.”

“[Req#a604ad] Error parsing XML: Empty “ non-existant file„”

How can I fix this?

Please help.