Uncaught Error: Class ‘RuleCriteria’ RuleCriteriaAge.php on line 15 openemr 6 and 7

When you click Admin->Practice->Rules,  you may get an unknown and blank tab. It means you can't add a new plan and rule.
You are supposed to get this configuration screen. However, you may encounter an error message with a blank unknown tab like the second image.

I think it is lacking the following statement in RuleCriteriaAge.php

Pu this line in the top 

require_once(library_src(‘RuleCriteria.php’));

XAMPP for Linux 7.4.29-1 (environment)

Fatal error : Uncaught Error: Class ‘RuleCriteria’ not found in /opt/lampp/htdocs/openemr7/interface/super/rules/library/RuleCriteriaAge.php:15 Stack trace: #0 /opt/lampp/htdocs/openemr7/interface/super/rules/include/header.php(30): require_once() #1 /opt/lampp/htdocs/openemr7/interface/super/rules/index.php(3): require_once(’/opt/lampp/htdo…’) #2 {main} thrown in /opt/lampp/htdocs/openemr7/interface/super/rules/library/RuleCriteriaAge.php on line 15