I upgraded check_mk from 1.6.p24 to 2.0.0p6 but get an error

Hello Christian,
I have couple of checks. see below.
Kind regards,
[asd2@gdnmonitor06 checks]$ ls -ltr
total 52
-rw-rw-r–. 1 root root 1366 Jun 20 2018 check_blacklist
-rw-rw-r–. 1 root root 1699 Jun 20 2018 check_mailwatch
-rw-rw-r–. 1 root root 1472 Nov 6 2018 check_puppet
-rw-rw-r–. 1 root root 9876 Feb 15 2019 check_jboss6
-rw-rw-r–. 1 root root 1357 Jun 13 2019 check_kernel
-rw-rw-r–. 1 asd2 asd2 2680 Jul 13 10:42 check_vhosts
-rw-rw-r–. 1 asd2 asd2 1655 Jul 13 10:43 check_vms
-rw-r–r–. 1 asd2 asd2 5513 Jul 13 10:43 check_http
-rw-rw-r–. 1 asd2 asd2 5513 Jul 13 10:43 check_check_http