Compiler error: "nmux bad ofst"

[PiDi]

Have anyone seen something like this?

"Compiler Error. Report this problem to National Instruments Tech Support.

nmux bad ofst"

(this is probably just another obscure error that almost nobody ever seen, but it's worth asking anyway...)

[Kyle97330]

What causes this message to appear?  Is it building an EXE, running a VI, editing a VI, or just loading a VI?

Can you reproduce it and maybe post file(s) that produce it?

[PiDi]

I just appeared as soon as I opened my main VI in the project and anytime I recompiled it (ctrl+run arrow). In the error window I got errors on certain VIs: "VI failed to compile". I deleted them from project and "nmux bad ofst" was gone (error window just showed expected "missing VI" errors). So I started to dig deeper into those deleted VIs. Long story short: a certain class did not like to be propagated from Event Data Node:

Making some changes to class data fixed the problem. I might have some code available for any brave NI R&D engineer who's willing to face this dragon ;D