squid 4.10 authentication not working

Hi All

im new to linux i have ubuntu 20.04.2 LTS server i have installed squid 4.10
the problem is im trying to enable authentication but im getting error in placing acl in squid.conf file im sharing my squid.conf

acl network src 192.168.x.x-192.168.x.x
acl proxyusers proxy_auth Required
http_access allow network
http_access allow localhost
http_access allow vpn
auth_param basic program usr/lib/squid/basic_ncsa_auth /etc/squid/squid_users
auth_parm children 5
auth_param basic realm Squid Proxy-caching web server
auth_param basic credentialsttl 2 hours

http_access allow proxyusers

i wonder should i need to configure squid with./configure or what should i do pls guide me. Thanks in advance..