Problem with ITEM

[joscu]

First of all thanks for the help and sorry for my bad english.

I im trying to monitor the free space of a qnap and and it gives me this error.

[aigars.kadikis]

What is the message when you click on the red exclamation mark?

[Engraf]

You are using a calculated item to get the percentage value of free space. Look at the formula used by this item. Perhaps it uses an unavailable item, or there is item in the formula that have not yet recived any value. This commmonly refers to the item "Total space" that usually sets to a large update interval.

[joscu]

What is the message when you click on the red exclamation mark?

[Atsushi]

I think the formula of the calculated item is incorrect.
Please tell me exactly what formula was set up.

[joscu]

@Atsushu

[Atsushi]

If it is an item in a discovery rule, the item key used for the expression must also be the key of the item registered in the discovery rule.
Is the argument of SysVolumeFreeSizeEX[] fixed with 1 in the item setting of the discovery rule?