It’'s hard to say what could cause this without any additional context, but also, Oxygene 5.2 is, literally, over a decade old. Does this issue persist with a kore recent (i.e. 10.x) build of Oxygene?
Indeed, later versions of Oxygene are a separate purchase directly from us, as our bundling agreement with Embarcadero ended.
Not really, I’m afraid, If you could send me the whole project to support@remobjects.com, I can see if the project compiles with latest (or if there error persists, but that is highly unlikely, as pretty much everything that could cause this kind of error has changed in the past 10 years). Alternatively, you could download our latest trial version and try with that…
FWIW, I just tried, and your project compiles ok for me with the latest Oxygene 10. So whatever the cause for the error may be, I suggest upgrading to the latest version will be the proper solution, as we cannot provide fixes for Oxygene 5 anymore, at this stage.