Monitoring Cisco router IPSec site to site VPN tunnel

Hi, I tried install thl-cmk vpn plugin and when I try reload cmk, then I get error

OMD[test01]:~$ cmk -Rvv --debug

Legacy check plugin still exists for check plugin cisco_vpn_tunnel. Please remove legacy plugin.
Traceback (most recent call last):
  File "/omd/sites/test01/lib/python3/cmk/base/config.py", line 2045, in _extract_check_plugins
    raise ValueError(
ValueError: Legacy check plugin still exists for check plugin cisco_vpn_tunnel. Please remove legacy plugin.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/omd/sites/test01/bin/cmk", line 79, in <module>
    errors = config.load_all_agent_based_plugins(check_api.get_check_api_context)
  File "/omd/sites/test01/lib/python3/cmk/base/config.py", line 1428, in load_all_agent_based_plugins
    errors.extend(load_checks(get_check_api_context, filelist))
  File "/omd/sites/test01/lib/python3/cmk/base/config.py", line 1577, in load_checks
    _extract_check_plugins(validate_creation_kwargs=did_compile))
  File "/omd/sites/test01/lib/python3/cmk/base/config.py", line 2061, in _extract_check_plugins
    raise MKGeneralException(exc) from exc
cmk.utils.exceptions.MKGeneralException: Legacy check plugin still exists for check plugin cisco_vpn_tunnel. Please remove legacy plugin.

Can you help me please?
Version: 2.0.0p21 (CEE)