CSF error : No response from subprocess Print

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While checking CSF firewall from WHM >>ConfigServer Security & Firewall 

No response from subprocess (whostmgr (cpanel)) with exit signal:


Internal Server Error

500

No response from subprocess (whostmgr (cpanel)) with exit signal: 2

cpsrvd/11.36.0.9 Server at ***.***.***.***

In order to resolve this install the perl module JSON::XS

Login to server with root user and execute the following command. 

root@server[]/scripts/perlinstaller JSON::XS

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