apt Update check 2.9.0 not working in check_mk 1.6.0p6

[Meridiana]

After upgrading from 1.5.0p11.cee to 1.6.0p6.cee the plugin gives errors:

The "extension packages" page shows:
Loading "/omd/sites/nagios/local/share/check_mk/web/plugins/wato/apt_check_pameters.py" failed

And on the "services" page of a host:
Invalid check parameter: The type must be a dictionary, but it is a NoneType
Variable: checkgroup_parameters:apt
Parameters:

None

[marvinwankersteen]

Same problem with the current version check-mk-raw-1.6.0p15.
This error is logged each time the WebGUI is loaded.

$ cat ~/var/log/web.log
2020-08-10 09:46:41,818 [40] [cmk.web 18493] Failed to load plugin /omd/sites/<site>/local/share/check_mk/web/plugins/wato/apt_check_pameters.py: 
Traceback (most recent call last):
  File "/omd/sites/<site>/lib/python/cmk/gui/utils.py", line 173, in load_web_plugins
    execfile(file_path, globalvars)
  File "/omd/sites/<site>/local/share/check_mk/web/plugins/wato/apt_check_pameters.py", line 15, in <module>
    None, None
  File "/omd/sites/<site>/lib/python/cmk/gui/plugins/wato/utils/__init__.py", line 724, in register_check_parameters
    raise NotImplementedError()
NotImplementedError

[schoekek]

pls use the latest version from check_mk exchange.