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I suspect the error message was spelled somewhat differently.
The long range radio, in such alarms, is actually a sort of cellular phone module.
If the cover on that module is open, it can signal a fault.
If the cover is closed in that case, the fault should go away.
If the cover is always closed, then you may have a problem with the long range or cellular phone module, and there is either calling an alarm co. to get it fixed, or going into your alarm's settings and disabling 'Long Range Radio' on it, which will also get rid of the error.
Given that the error only comes up now and then, and is not constant... I would say you simply don't need to do much.
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