The automatic error pop-up is not specific to those VIs, but is a general LV behaviour. Basically, each node that has an error and doesn't have its error terminal wired into something causes these pop-up to appear. This can be disabled in the options menu.
However, I would strongly advise against that - error handling is very important. To avoid the pop-ups all you need to do is wire the error cluster and handle the error. In this case, check the error number. If it is an error you want to ignore, pass an empty error cluster on. If you don't want to ignore it, pass the original error cluster.
To sum it up - always use the error wires to pass the error data and handle the errors properly. It will allow you to know where the error is in case you have it. Leave auto-error-handling on just in case you forgot to wire an error cluster somewhere.
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