A PHP Error was encountered

Severity: Core Warning

Message: PHP Startup: Unable to load dynamic library 'mosquitto.so' (tried: /usr/lib/php/20180731/mosquitto.so (/usr/lib/php/20180731/mosquitto.so: cannot open shared object file: No such file or directory), /usr/lib/php/20180731/mosquitto.so.so (/usr/lib/php/20180731/mosquitto.so.so: cannot open shared object file: No such file or directory))

Filename: Unknown

Line Number: 0

Backtrace: