Run EXE and Pop up message: can't load Actor's message.lvclass

[Sailfish11397]

I  use AF(LV2018) to build an app  and  run it  fine in dev.  As I build  Exe, and run it. It pops up one message: unspecified error occurred, couldn't  load file:" Rmsg_XXXX.lvclass" .    The Rmsg_XXX.lvclass  is  a messge created by MGI Tool (message maker).     I had try any ways to deal with it but can't solve it.    

[BertMcMahan]

Make sure that lvclass file is included in your build spec.