I keep getting this error lately:

"An error occurred during a connection to dav.box.com.
Encountered end of file
Error code: PR_END_OF_FILE_ERROR"

The error leads me to this page: https://www.zotero.org/support/kb/ssl_certificate_error

I did everything suggested, but I kept getting the same error. Any way to solve this? Can't sync my files for more than a week now...