so here it is.....
Code:
Get:1 http://mirrors.ocf.berkeley.edu/kali kali-rolling InRelease [30.5 kB]
Get:2 http://mirrors.ocf.berkeley.edu/kali kali-rolling/main amd64 Packages [17.1 MB]
Get:3 http://mirrors.ocf.berkeley.edu/kali kali-rolling/main amd64 Contents (deb) [38.2 MB]
Ign:3 http://mirrors.ocf.berkeley.edu/kali kali-rolling/main amd64 Contents (deb)
Get:4 http://mirrors.ocf.berkeley.edu/kali kali-rolling/non-free amd64 Packages [202 kB]
Ign:3 http://http.kali.org/kali kali-rolling/main amd64 Contents (deb)         
Get:5 http://mirrors.ocf.berkeley.edu/kali kali-rolling/non-free amd64 Contents (deb) [915 kB]
Err:3 http://http.kali.org/kali kali-rolling/main amd64 Contents (deb)         
  File has unexpected size (38203709 != 38202390). Mirror sync in progress? [IP: 2607:f140:8801::1:30 80]
Get:6 http://mirrors.ocf.berkeley.edu/kali kali-rolling/contrib amd64 Packages [105 kB]
Get:7 http://mirrors.ocf.berkeley.edu/kali kali-rolling/contrib amd64 Contents (deb) [115 kB]
Fetched 1,367 kB in 2s (557 kB/s)        
Traceback (most recent call last):
  File "/usr/bin/debtags", line 700, in <module>
    main()
  File "/usr/bin/debtags", line 694, in main
    sys.exit(action.main(args))
  File "/usr/bin/debtags", line 632, in main
    for pkg, tags in self.tags_from_apt():
  File "/usr/bin/debtags", line 256, in tags_from_apt
    cache = self.apt_cache
  File "/usr/bin/debtags", line 241, in apt_cache
    res = self._apt_cache = apt.Cache()
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 152, in __init__
    self.open(progress)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 214, in open
    self._cache = apt_pkg.Cache(progress)
apt_pkg.Error: E:The value 'stable' is invalid for APT::Default-Release as such a release is not available in the sources
Reading package lists... Done
E: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/main/Contents-amd64  File has unexpected size (38203709 != 38202390). Mirror sync in progress? [IP: 2607:f140:8801::1:30 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

my sources.list
Code:
deb http://http.kali.org/kali kali-rolling main non-free contrib

thanks for the help in advance!
- Dointhamost