Technical Issue – Twig

Getting this error email if I try to install/ activate any plugin,

Error Details 
============= 
An error of type E_ERROR was caused in line 56 of the file 
/home/domain.tld/public_html/wp-content/plugins/wp-simple-firewall/src/lib/vendor/twig/twig/src/Lexer.php. 
Error message: Uncaught TypeError: Argument 1 passed to 
Twig\Lexer::__construct() must be an instance of Twig\Environment, 
instance of Twig_Environment given, called in 
/home/domain.tld/public_html/wp-content/plugins/data-tables-generator-by-supsystic/vendor/Twig/Environment.php 
on line 650 and defined in 
/home/domain.tld/public_html/wp-content/plugins/wp-simple-firewall/src/lib/vendor/twig/twig/src/Lexer.php:56 
Stack trace: 
#0 /home/domain.tld/public_html/wp-content/plugins/data-tables-generator-by-supsystic/vendor/Twig/Environment.php(650): 
Twig\Lexer->__construct(Object(Twig_Environment)) 
#1 /home/domain.tld/public_html/wp-content/plugins/data-tables-generator-by-supsystic/vendor/Twig/Environment.php(750): 
Twig_Environment->tokenize(Object(Twig\Source)) 
#2 /home/domain.tld/public_html/wp-content/plugins/data-tables-generator-by-supsystic/vendor/Twig/Environment.php(447): 
Twig_Environment->compileSource(Object(Twig\Source))
...