Description of problem:
dnf update show following infomations

AnolisOS-8 - AppStream                                                                                                                                                                                                                         54 kB/s | 4.3 kB     00:00    
terminate called after throwing an instance of 'libdnf::ModulePackageContainer::ResolveException'
  what():  Failed to update from string: Parser error
Aborted (core dumped)

Version-Release number of selected component (if applicable):
AnolisOS 8.6

How reproducible:
repeat same operation and still  the same info


Additional info:
if disable the AppStream repo and run dnf ,the infomations is follow:
Last metadata expiration check: 0:28:03 ago on Wed 09 Nov 2022 12:08:16 PM CST.
Error: 
 Problem: package gnutls-utils-3.6.16-4.0.1.an8.x86_64 requires gnutls(x86-64) = 3.6.16-4.0.1.an8, but none of the providers can be installed
  - cannot install both gnutls-3.6.16-5.0.1.an8_6.x86_64 and gnutls-3.6.16-4.0.1.an8.x86_64
  - cannot install the best update candidate for package gnutls-3.6.16-4.0.1.an8.x86_64
  - problem with installed package gnutls-utils-3.6.16-4.0.1.an8.x86_64
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)