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domain.com is currently unable to handle this request. HTTP ERROR 500

domain.com is currently unable to handle this request. HTTP ERROR 500

I magento 2.3.x  installed in C-panel by softaculous apps installer 

 

it show following error in browser

is currently unable to handle this request.

HTTP ERROR 500
 
in log show me this error 

PHP Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /home/basshopbd/public_html/generated/code/Magento/Framework/App/Response/Http/Interceptor.php on line 11