apache2: Syntax error on line 80 of /etc/apache2/apache2.conf: DefaultRuntimeDir must be a valid directory, absolute or relative to ServerRoot

I installed apache2 in my ubutu server 20.04, but when i troubleshoot the syntax by sudo apache2 -t, it gives me the following errro:

[Sun Apr 17 08:43:12.116347 2022] [core:warn] [pid 34462] AH00111: Config variable ${APACHE_RUN_DIR} is not definedapache2: Syntax error on line 80 of /etc/apache2/apache2.conf: DefaultRuntimeDir must be a valid directory, absolute or relative to ServerRoot

but the apache2 is running and active status.