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Just mention GOOP 3 times and it will summon MikaelH - who can tell you everything about it.

Last week, Matlab R2023a was released. The changelog document for this (6-month cadence) release is 600 pages long!!! How come NI releases main development software with a 1-page changelog and makes it almost unusable with more issues than before??? How many NI engineers does it take to change an icon?

The error message is telling you that your "Axis" enum control doesn't have an item called "X" (upper case) You can edit the item list of your enum by right clicking on it on the front panel and select "Edit Items...." or change or simply remove the "X" in the case structure selector value on the block diagram

Technically it is all passed around by pointer, which is synonymous to by reference. Logically that makes no difference whatsoever as it all happens under the hood. Data going into a subVI through the connector into a control is consumed by that subVI and considered to be private to the VI. If LabVIEW needs that data somewhere else, it will make a copy, but it has optimizing measures in place that may schedule different functions consuming the same data in a way that they can not stomp on each others data. Data coming through an indicator out of a subVI is from that point owned by the caller and the VI better doesn't try to change it after the fact. For LabVIEW VIs that is not a possibility at all as LabVIEW takes care of that. For data returned from external code through a Call Library Node, it is a grave violation of the LabVIEW memory management contract to try to modify the data in the background once the Call Library Node call has returned control to the diagram. LabVIEW is a managed environment just like .Net but has different management rules. As far as LabVIEW diagrams are concerned there is virtually no way to violate those rules since the dataflow determines everything. If you interface to external code then you could violate that management contract in the external code but doing so is equivalent to placing a bomb in your PC! 💣