Warning in 0.88.1

I get this warning after upgrading to 0.88.1 from 0.87.1

How to know which entity is about?
How to fix it?

Can you be more precise? How to have that script and how to run it?
EDIT: i ran the script but i get the following:

pi@hassbian:/home/homeassistant/.homeassistant$ ./cleanerror.sh
cleaning   :: usage: cleanmqtt 
Error: Unknown option '“#”'.

Use 'mosquitto_sub --help' to see usage.

No idea. You’d be better off asking InstigatorX in the other thread.