Cannot evaluate function "data item"

[xofisase]

Hi!
There is a question. Template is created, data elements and triggers are prescribed in it - everything is active, no problems.
I have added nodes in the network nodes in the template. On some nodes, triggers are active and everything is fine. On some triggers it says Cannot evaluate function "data item". What can it be related to?
The rule is the same for all of them. Thanks for the answers.

[cyber]

Why you leave us hanging.. If you want some help, please specify, what kind of items/triggers you have, show some config. We are not miracle workers here..

Let me guess.... Calculated items? Maybe not enough data to calculate from?

[petermilburn]

I have the same issue with a Cisco 9800 WLC. The weird thing is it worked a couple of days ago. I deleted the host and recreated it and then copy and pasted the fomula back in and now I am getting the same error. Here is a couple of lines any help would be great

last(/192.168.45.15/bsnApIfNoOfUsers1[Hartzer-ConferenceRoom])+
last(/192.168.45.15/bsnApIfNoOfUsers1[APE44E.2DB5.55A4])