Error Fetching mails

Error Fetching mails

Suddenly mails are not retrieved to my gmail account . we are getting this error.
Can you please check ?

Zoho User Id: 647424251


Wed, Jun 27, 2018 at 3:49 PM
 Error reading mail.
Server returned error "Bad msg size: 1 -1"
Wed, Jun 27, 2018 at 3:35 PM
 Error reading mail.
Server returned error "Bad msg size: 1 -1"
Wed, Jun 27, 2018 at 2:42 PM
 Error reading mail.
Server returned error "Bad msg size: 1 -1"
Wed, Jun 27, 2018 at 2:19 PM
 Error reading mail.
Server returned error "Bad msg size: 1 -1"
Wed, Jun 27, 2018 at 2:09 PM
 Error reading mail.
Server returned error "Bad msg size: 1 -1"